InputDeviceSettings refactoring.

Standalone functions replaced with InputDeviceSettings interface and
singleton implementation InputDeviceSettingsImpl.
Changing of input device settings became more efficient for two reasons:
1) InputDeviceSettingsImpl caches previously set values and doesn't
call tpcontrol/mousecontrol if client tries to set same values twice.
2) New methods for changing several settings at a time was implemented. For
example, If client wants to change several touchpad settings at a time,
he can use UpdateTouchpadSettings method that will result in one (or
zero) invocation of tpcontrol.

Implemented FakeInputDeviceSettings for use in tests.

These changes are needed for upcoming changes in chromeos::Preferences.

BUG=325564
TEST=manually
TBR=scheib

Review URL: https://codereview.chromium.org/147133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251399 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/keyboard_driven_event_rewriter.cc

@@ -21,7 +21,8 @@ const int kModifierMask = ui::EF_SHIFT_DOWN;
 bool ShouldStripModifiersForArrowKeysAndEnter() {
   if (UserManager::IsInitialized() &&
       !UserManager::Get()->IsUserLoggedIn()) {
-    return system::keyboard_settings::ForceKeyboardDrivenUINavigation();
+    return system::InputDeviceSettings::Get()
+        ->ForceKeyboardDrivenUINavigation();
   }
 
   return false;

chrome/browser/chromeos/login/login_display_host_impl.cc

@@ -958,7 +958,7 @@ void LoginDisplayHostImpl::InitLoginWindowAndView() {
   if (login_window_)
     return;
 
-  if (system::keyboard_settings::ForceKeyboardDrivenUINavigation()) {
+  if (system::InputDeviceSettings::Get()->ForceKeyboardDrivenUINavigation()) {
     views::FocusManager::set_arrow_key_traversal_enabled(true);
 
     focus_ring_controller_.reset(new FocusRingController);
@@ -1083,10 +1083,10 @@ void ShowLoginWizard(const std::string& first_screen_name) {
     PrefService* prefs = g_browser_process->local_state();
     // Apply owner preferences for tap-to-click and mouse buttons swap for
     // login screen.
-    system::mouse_settings::SetPrimaryButtonRight(
+    system::InputDeviceSettings::Get()->SetPrimaryButtonRight(
         prefs->GetBoolean(prefs::kOwnerPrimaryMouseButtonRight));
-    system::touchpad_settings::SetTapToClick(
-      prefs->GetBoolean(prefs::kOwnerTapToClickEnabled));
+    system::InputDeviceSettings::Get()->SetTapToClick(
+        prefs->GetBoolean(prefs::kOwnerTapToClickEnabled));
   }
 
   ui::SetNaturalScroll(CommandLine::ForCurrentProcess()->HasSwitch(

chrome/browser/chromeos/preferences.cc

@@ -407,6 +407,8 @@ void Preferences::OnPreferenceChanged(const std::string& pref_name) {
 }
 
 void Preferences::NotifyPrefChanged(const std::string* pref_name) {
+  system::TouchpadSettings touchpad_settings;
+  system::MouseSettings mouse_settings;
   if (!pref_name || *pref_name == prefs::kPerformanceTracingEnabled) {
     const bool enabled = performance_tracing_enabled_.GetValue();
     if (enabled)
@@ -417,7 +419,7 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
   if ((!pref_name && is_primary_user_prefs_) ||
       (pref_name && *pref_name == prefs::kTapToClickEnabled)) {
     const bool enabled = tap_to_click_enabled_.GetValue();
-    system::touchpad_settings::SetTapToClick(enabled);
+    touchpad_settings.SetTapToClick(enabled);
     if (pref_name)
       UMA_HISTOGRAM_BOOLEAN("Touchpad.TapToClick.Changed", enabled);
     else
@@ -433,7 +435,7 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
   if ((!pref_name && is_primary_user_prefs_) ||
       (pref_name && *pref_name == prefs::kTapDraggingEnabled)) {
     const bool enabled = tap_dragging_enabled_.GetValue();
-    system::touchpad_settings::SetTapDragging(enabled);
+    touchpad_settings.SetTapDragging(enabled);
     if (pref_name)
       UMA_HISTOGRAM_BOOLEAN("Touchpad.TapDragging.Changed", enabled);
     else
@@ -442,7 +444,7 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
   if ((!pref_name && is_primary_user_prefs_) ||
       (pref_name && *pref_name == prefs::kEnableTouchpadThreeFingerClick)) {
     const bool enabled = three_finger_click_enabled_.GetValue();
-    system::touchpad_settings::SetThreeFingerClick(enabled);
+    touchpad_settings.SetThreeFingerClick(enabled);
     if (pref_name)
       UMA_HISTOGRAM_BOOLEAN("Touchpad.ThreeFingerClick.Changed", enabled);
     else
@@ -465,7 +467,7 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
   if ((!pref_name && is_primary_user_prefs_) ||
       (pref_name && *pref_name == prefs::kMouseSensitivity)) {
     const int sensitivity = mouse_sensitivity_.GetValue();
-    system::mouse_settings::SetSensitivity(sensitivity);
+    mouse_settings.SetSensitivity(sensitivity);
     if (pref_name) {
       UMA_HISTOGRAM_ENUMERATION("Mouse.PointerSensitivity.Changed",
                                 sensitivity,
@@ -479,7 +481,7 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
   if ((!pref_name && is_primary_user_prefs_) ||
       (pref_name && *pref_name == prefs::kTouchpadSensitivity)) {
     const int sensitivity = touchpad_sensitivity_.GetValue();
-    system::touchpad_settings::SetSensitivity(sensitivity);
+    touchpad_settings.SetSensitivity(sensitivity);
     if (pref_name) {
       UMA_HISTOGRAM_ENUMERATION("Touchpad.PointerSensitivity.Changed",
                                 sensitivity,
@@ -493,7 +495,7 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
   if ((!pref_name && is_primary_user_prefs_) ||
       (pref_name && *pref_name == prefs::kPrimaryMouseButtonRight)) {
     const bool right = primary_mouse_button_right_.GetValue();
-    system::mouse_settings::SetPrimaryButtonRight(right);
+    mouse_settings.SetPrimaryButtonRight(right);
     if (pref_name)
       UMA_HISTOGRAM_BOOLEAN("Mouse.PrimaryButtonRight.Changed", right);
     else
@@ -556,6 +558,8 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
 
     input_method_manager_->SetEnabledExtensionImes(&split_values);
   }
+  system::InputDeviceSettings::Get()->UpdateTouchpadSettings(touchpad_settings);
+  system::InputDeviceSettings::Get()->UpdateMouseSettings(mouse_settings);
 }
 
 void Preferences::OnIsSyncingChanged() {

chrome/browser/chromeos/system/device_change_handler.cc

@@ -4,11 +4,7 @@
 
 #include "chrome/browser/chromeos/system/device_change_handler.h"
 
-#include "base/prefs/pref_service.h"
-#include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/system/input_device_settings.h"
-#include "chrome/browser/profiles/profile_manager.h"
-#include "chrome/common/pref_names.h"
 
 namespace chromeos {
 namespace system {
@@ -27,55 +23,20 @@ DeviceChangeHandler::~DeviceChangeHandler() {
   pointer_device_observer_->RemoveObserver(this);
 }
 
-// When we detect a touchpad is attached, apply touchpad settings of the
-// primary profile.
+// When we detect a touchpad is attached, apply touchpad settings that was
+// cached inside InputDeviceSettings.
 void DeviceChangeHandler::TouchpadExists(bool exists) {
   if (!exists)
     return;
-
-  // Using GetPrimaryUserProfile here because this is a system setting which can
-  // only be set by the user which starts the session.
-  PrefService* prefs = ProfileManager::GetPrimaryUserProfile()->GetPrefs();
-
-  const bool tap_dragging = prefs->GetBoolean(prefs::kTapDraggingEnabled);
-  system::touchpad_settings::SetTapDragging(tap_dragging);
-
-  const bool three_finger_click =
-      prefs->GetBoolean(prefs::kEnableTouchpadThreeFingerClick);
-  system::touchpad_settings::SetThreeFingerClick(three_finger_click);
-
-  const int sensitivity = prefs->GetInteger(prefs::kTouchpadSensitivity);
-  system::touchpad_settings::SetSensitivity(sensitivity);
-
-  // If we are not logged in, use owner preferences.
-  PrefService* local_prefs = g_browser_process->local_state();
-  const bool tap_to_click =
-      g_browser_process->profile_manager()->IsLoggedIn() ?
-          prefs->GetBoolean(prefs::kTapToClickEnabled) :
-          local_prefs->GetBoolean(prefs::kOwnerTapToClickEnabled);
-  system::touchpad_settings::SetTapToClick(tap_to_click);
+  system::InputDeviceSettings::Get()->ReapplyTouchpadSettings();
 }
 
-// When we detect a mouse is attached, apply mouse settings of the primary
-// profile.
+// When we detect a mouse is attached, apply mouse settings that was cached
+// inside InputDeviceSettings.
 void DeviceChangeHandler::MouseExists(bool exists) {
   if (!exists)
     return;
-
-  // Using GetPrimaryUserProfile here because this is the property which can
-  // only be set by the user which starts the session.
-  PrefService* prefs = ProfileManager::GetPrimaryUserProfile()->GetPrefs();
-
-  const int sensitivity = prefs->GetInteger(prefs::kMouseSensitivity);
-  system::mouse_settings::SetSensitivity(sensitivity);
-
-  // If we are not logged in, use owner preferences.
-  PrefService* local_prefs = g_browser_process->local_state();
-  const bool primary_button_right =
-      g_browser_process->profile_manager()->IsLoggedIn() ?
-          prefs->GetBoolean(prefs::kPrimaryMouseButtonRight) :
-          local_prefs->GetBoolean(prefs::kOwnerPrimaryMouseButtonRight);
-  system::mouse_settings::SetPrimaryButtonRight(primary_button_right);
+  system::InputDeviceSettings::Get()->ReapplyMouseSettings();
 }
 
 }  // namespace system

chrome/browser/chromeos/system/device_change_handler.h

@@ -12,7 +12,7 @@ namespace chromeos {
 namespace system {
 
 // Observes changes in device hierarchy. When a new touchpad/mouse is attached,
-// applies the last used profile's touchpad/mouse settings to the system.
+// applies the last used touchpad/mouse settings to the system.
 class DeviceChangeHandler : public PointerDeviceObserver::Observer {
  public:
   DeviceChangeHandler();
@@ -27,7 +27,7 @@ class DeviceChangeHandler : public PointerDeviceObserver::Observer {
 };
 
 }  // namespace system
-}  // namesspace chromeos
+}  // namespace chromeos
 
 
 #endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_DEVICE_CHANGE_HANDLER_H_

chrome/browser/chromeos/system/fake_input_device_settings.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/chromeos/system/fake_input_device_settings.h"
+
+namespace chromeos {
+namespace system {
+
+FakeInputDeviceSettings::FakeInputDeviceSettings() {}
+
+FakeInputDeviceSettings::~FakeInputDeviceSettings() {}
+
+// Overriden from InputDeviceSettings.
+void FakeInputDeviceSettings::TouchpadExists(
+    const DeviceExistsCallback& callback) {
+  callback.Run(true);
+}
+
+void FakeInputDeviceSettings::UpdateTouchpadSettings(
+    const TouchpadSettings& settings) {
+  current_touchpad_settings_.Update(settings, NULL);
+}
+
+void FakeInputDeviceSettings::SetTouchpadSensitivity(int value) {
+  TouchpadSettings settings;
+  settings.SetSensitivity(value);
+  UpdateTouchpadSettings(settings);
+}
+
+void FakeInputDeviceSettings::SetTapToClick(bool enabled) {
+  TouchpadSettings settings;
+  settings.SetTapToClick(enabled);
+  UpdateTouchpadSettings(settings);
+}
+
+void FakeInputDeviceSettings::SetThreeFingerClick(bool enabled) {
+  TouchpadSettings settings;
+  settings.SetThreeFingerClick(enabled);
+  UpdateTouchpadSettings(settings);
+}
+
+void FakeInputDeviceSettings::SetTapDragging(bool enabled) {
+  TouchpadSettings settings;
+  settings.SetTapDragging(enabled);
+  UpdateTouchpadSettings(settings);
+}
+
+void FakeInputDeviceSettings::MouseExists(
+    const DeviceExistsCallback& callback) {
+  callback.Run(false);
+}
+
+void FakeInputDeviceSettings::UpdateMouseSettings(
+    const MouseSettings& settings) {
+  current_mouse_settings_.Update(settings, NULL);
+}
+
+void FakeInputDeviceSettings::SetMouseSensitivity(int value) {
+  MouseSettings settings;
+  settings.SetSensitivity(value);
+  UpdateMouseSettings(settings);
+}
+
+void FakeInputDeviceSettings::SetPrimaryButtonRight(bool right) {
+  MouseSettings settings;
+  settings.SetPrimaryButtonRight(right);
+  UpdateMouseSettings(settings);
+}
+
+bool FakeInputDeviceSettings::ForceKeyboardDrivenUINavigation() {
+  return false;
+}
+
+void FakeInputDeviceSettings::ReapplyTouchpadSettings() {
+}
+
+void FakeInputDeviceSettings::ReapplyMouseSettings() {
+}
+
+}  // namespace system
+}  // namespace chromeos

chrome/browser/chromeos/system/fake_input_device_settings.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_CHROMEOS_SYSTEM_FAKE_INPUT_DEVICE_SETTINGS_H_
+#define CHROME_BROWSER_CHROMEOS_SYSTEM_FAKE_INPUT_DEVICE_SETTINGS_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "chrome/browser/chromeos/system/input_device_settings.h"
+
+namespace chromeos {
+namespace system {
+
+// This fake just memorizes current values of input devices settings.
+class FakeInputDeviceSettings : public InputDeviceSettings {
+ public:
+  FakeInputDeviceSettings();
+  virtual ~FakeInputDeviceSettings();
+
+  // Overridden from InputDeviceSettings.
+  virtual void TouchpadExists(const DeviceExistsCallback& callback) OVERRIDE;
+  virtual void UpdateTouchpadSettings(const TouchpadSettings& settings)
+      OVERRIDE;
+  virtual void SetTouchpadSensitivity(int value) OVERRIDE;
+  virtual void SetTapToClick(bool enabled) OVERRIDE;
+  virtual void SetThreeFingerClick(bool enabled) OVERRIDE;
+  virtual void SetTapDragging(bool enabled) OVERRIDE;
+  virtual void MouseExists(const DeviceExistsCallback& callback) OVERRIDE;
+  virtual void UpdateMouseSettings(const MouseSettings& settings) OVERRIDE;
+  virtual void SetMouseSensitivity(int value) OVERRIDE;
+  virtual void SetPrimaryButtonRight(bool right) OVERRIDE;
+  virtual bool ForceKeyboardDrivenUINavigation() OVERRIDE;
+  virtual void ReapplyTouchpadSettings() OVERRIDE;
+  virtual void ReapplyMouseSettings() OVERRIDE;
+
+  const TouchpadSettings& current_touchpad_settings() const {
+    return current_touchpad_settings_;
+  }
+
+  const MouseSettings& current_mouse_settings() const {
+    return current_mouse_settings_;
+  }
+
+ private:
+  TouchpadSettings current_touchpad_settings_;
+  MouseSettings current_mouse_settings_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeInputDeviceSettings);
+};
+
+}  // namespace system
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_FAKE_INPUT_DEVICE_SETTINGS_H_

chrome/browser/chromeos/system/input_device_settings.cc

@@ -4,10 +4,6 @@
 
 #include "chrome/browser/chromeos/system/input_device_settings.h"
 
-#include <stdarg.h>
-#include <string>
-#include <vector>
-
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ -34,6 +30,9 @@ namespace system {
 
 namespace {
 
+InputDeviceSettings* g_instance_;
+InputDeviceSettings* g_test_instance_;
+
 const char kTpControl[] = "/opt/google/touchpad/tpcontrol";
 const char kMouseControl[] = "/opt/google/mouse/mousecontrol";
 
@@ -63,15 +62,14 @@ void ExecuteScriptOnFileThread(const std::vector<std::string>& argv) {
   base::EnsureProcessGetsReaped(handle);
 }
 
-void ExecuteScript(int argc, ...) {
+void ExecuteScript(const std::vector<std::string>& argv) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  std::vector<std::string> argv;
-  va_list vl;
-  va_start(vl, argc);
-  for (int i = 0; i < argc; ++i) {
-    argv.push_back(va_arg(vl, const char*));
-  }
-  va_end(vl);
+
+  if (argv.size() == 1)
+    return;
+
+  VLOG(1) << "About to launch: \""
+          << CommandLine(argv).GetCommandLineString() << "\"";
 
   // Control scripts can take long enough to cause SIGART during shutdown
   // (http://crbug.com/261426). Run the blocking pool task with
@@ -83,15 +81,17 @@ void ExecuteScript(int argc, ...) {
   runner->PostTask(FROM_HERE, base::Bind(&ExecuteScriptOnFileThread, argv));
 }
 
-void SetPointerSensitivity(const char* script, int value) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+void AddSensitivityArguments(int value, std::vector<std::string>* argv) {
   DCHECK(value >= kMinPointerSensitivity && value <= kMaxPointerSensitivity);
-  ExecuteScript(
-      3, script, "sensitivity", base::StringPrintf("%d", value).c_str());
+  argv->push_back("sensitivity");
+  argv->push_back(base::StringPrintf("%d", value));
 }
 
-void SetTPControl(const char* control, bool enabled) {
-  ExecuteScript(3, kTpControl, control, enabled ? "on" : "off");
+void AddTPControlArguments(const char* control,
+                           bool enabled,
+                           std::vector<std::string>* argv) {
+  argv->push_back(control);
+  argv->push_back(enabled ? "on" : "off");
 }
 
 void DeviceExistsBlockingPool(const char* script,
@@ -111,14 +111,16 @@ void DeviceExistsBlockingPool(const char* script,
   DVLOG(1) << "DeviceExistsBlockingPool:" << script << "=" << exists->data;
 }
 
-void RunCallbackUIThread(scoped_refptr<RefCountedBool> exists,
-                         const DeviceExistsCallback& callback) {
+void RunCallbackUIThread(
+    scoped_refptr<RefCountedBool> exists,
+    const InputDeviceSettings::DeviceExistsCallback& callback) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   DVLOG(1) << "RunCallbackUIThread " << exists->data;
   callback.Run(exists->data);
 }
 
-void DeviceExists(const char* script, const DeviceExistsCallback& callback) {
+void DeviceExists(const char* script,
+                  const InputDeviceSettings::DeviceExistsCallback& callback) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 
   // One or both of the control scripts can apparently hang during shutdown
@@ -134,62 +136,98 @@ void DeviceExists(const char* script, const DeviceExistsCallback& callback) {
       base::Bind(&RunCallbackUIThread, exists, callback));
 }
 
-}  // namespace
-
-namespace touchpad_settings {
-
-void TouchpadExists(const DeviceExistsCallback& callback) {
+class InputDeviceSettingsImpl : public InputDeviceSettings {
+ public:
+  InputDeviceSettingsImpl();
+
+ private:
+  // Overridden from InputDeviceSettings.
+  virtual void TouchpadExists(const DeviceExistsCallback& callback) OVERRIDE;
+  virtual void UpdateTouchpadSettings(const TouchpadSettings& settings)
+      OVERRIDE;
+  virtual void SetTouchpadSensitivity(int value) OVERRIDE;
+  virtual void SetTapToClick(bool enabled) OVERRIDE;
+  virtual void SetThreeFingerClick(bool enabled) OVERRIDE;
+  virtual void SetTapDragging(bool enabled) OVERRIDE;
+  virtual void MouseExists(const DeviceExistsCallback& callback) OVERRIDE;
+  virtual void UpdateMouseSettings(const MouseSettings& update) OVERRIDE;
+  virtual void SetMouseSensitivity(int value) OVERRIDE;
+  virtual void SetPrimaryButtonRight(bool right) OVERRIDE;
+  virtual bool ForceKeyboardDrivenUINavigation() OVERRIDE;
+  virtual void ReapplyTouchpadSettings() OVERRIDE;
+  virtual void ReapplyMouseSettings() OVERRIDE;
+
+ private:
+  TouchpadSettings current_touchpad_settings_;
+  MouseSettings current_mouse_settings_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputDeviceSettingsImpl);
+};
+
+InputDeviceSettingsImpl::InputDeviceSettingsImpl() {}
+
+void InputDeviceSettingsImpl::TouchpadExists(
+    const DeviceExistsCallback& callback) {
   DeviceExists(kTpControl, callback);
 }
 
-// Sets the touchpad sensitivity in the range [1, 5].
-void SetSensitivity(int value) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  SetPointerSensitivity(kTpControl, value);
+void InputDeviceSettingsImpl::UpdateTouchpadSettings(
+    const TouchpadSettings& settings) {
+  std::vector<std::string> argv;
+  if (current_touchpad_settings_.Update(settings, &argv))
+    ExecuteScript(argv);
 }
 
-void SetTapToClick(bool enabled) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  SetTPControl("taptoclick", enabled);
+void InputDeviceSettingsImpl::SetTouchpadSensitivity(int value) {
+  TouchpadSettings settings;
+  settings.SetSensitivity(value);
+  UpdateTouchpadSettings(settings);
 }
 
-void SetThreeFingerClick(bool enabled) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+void InputDeviceSettingsImpl::SetTapToClick(bool enabled) {
+  TouchpadSettings settings;
+  settings.SetTapToClick(enabled);
+  UpdateTouchpadSettings(settings);
+}
 
+void InputDeviceSettingsImpl::SetThreeFingerClick(bool enabled) {
   // For Alex/ZGB.
-  SetTPControl("t5r2_three_finger_click", enabled);
+  TouchpadSettings settings;
+  settings.SetThreeFingerClick(enabled);
+  UpdateTouchpadSettings(settings);
 }
 
-void SetTapDragging(bool enabled) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  SetTPControl("tap_dragging", enabled);
+void InputDeviceSettingsImpl::SetTapDragging(bool enabled) {
+  TouchpadSettings settings;
+  settings.SetTapDragging(enabled);
+  UpdateTouchpadSettings(settings);
 }
 
-}  // namespace touchpad_settings
-
-namespace mouse_settings {
-
-void MouseExists(const DeviceExistsCallback& callback) {
+void InputDeviceSettingsImpl::MouseExists(
+    const DeviceExistsCallback& callback) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   DeviceExists(kMouseControl, callback);
 }
 
-// Sets the touchpad sensitivity in the range [1, 5].
-void SetSensitivity(int value) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  SetPointerSensitivity(kMouseControl, value);
+void InputDeviceSettingsImpl::UpdateMouseSettings(const MouseSettings& update) {
+  std::vector<std::string> argv;
+  if (current_mouse_settings_.Update(update, &argv))
+    ExecuteScript(argv);
 }
 
-void SetPrimaryButtonRight(bool right) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  ExecuteScript(3, kMouseControl, "swap_left_right", right ? "1" : "0");
+void InputDeviceSettingsImpl::SetMouseSensitivity(int value) {
+  MouseSettings settings;
+  settings.SetSensitivity(value);
+  UpdateMouseSettings(settings);
 }
 
-}  // namespace mouse_settings
-
-namespace keyboard_settings {
+void InputDeviceSettingsImpl::SetPrimaryButtonRight(bool right) {
+  MouseSettings settings;
+  settings.SetPrimaryButtonRight(right);
+  UpdateMouseSettings(settings);
+}
 
-bool ForceKeyboardDrivenUINavigation() {
+bool InputDeviceSettingsImpl::ForceKeyboardDrivenUINavigation() {
   policy::BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   if (!connector)
@@ -207,14 +245,164 @@ bool ForceKeyboardDrivenUINavigation() {
 
   bool keyboard_driven = false;
   if (chromeos::system::StatisticsProvider::GetInstance()->GetMachineFlag(
-      kOemKeyboardDrivenOobeKey, &keyboard_driven)) {
+          kOemKeyboardDrivenOobeKey, &keyboard_driven)) {
     return keyboard_driven;
   }
 
   return false;
 }
 
-}  // namespace keyboard_settings
+void InputDeviceSettingsImpl::ReapplyTouchpadSettings() {
+  TouchpadSettings settings = current_touchpad_settings_;
+  current_touchpad_settings_ = TouchpadSettings();
+  UpdateTouchpadSettings(settings);
+}
+
+void InputDeviceSettingsImpl::ReapplyMouseSettings() {
+  MouseSettings settings = current_mouse_settings_;
+  current_mouse_settings_ = MouseSettings();
+  UpdateMouseSettings(settings);
+}
+
+}  // namespace
+
+TouchpadSettings::TouchpadSettings() {}
+
+TouchpadSettings& TouchpadSettings::operator=(const TouchpadSettings& other) {
+  if (&other != this) {
+    sensitivity_ = other.sensitivity_;
+    tap_to_click_ = other.tap_to_click_;
+    three_finger_click_ = other.three_finger_click_;
+    tap_dragging_ = other.tap_dragging_;
+  }
+  return *this;
+}
+
+void TouchpadSettings::SetSensitivity(int value) {
+  sensitivity_.Set(value);
+}
+
+int TouchpadSettings::GetSensitivity() const {
+  return sensitivity_.value();
+}
+
+void TouchpadSettings::SetTapToClick(bool enabled) {
+  tap_to_click_.Set(enabled);
+}
+
+bool TouchpadSettings::GetTapToClick() const {
+  return tap_to_click_.value();
+}
+
+void TouchpadSettings::SetThreeFingerClick(bool enabled) {
+  three_finger_click_.Set(enabled);
+}
+
+bool TouchpadSettings::GetThreeFingerClick() const {
+  return three_finger_click_.value();
+}
+
+void TouchpadSettings::SetTapDragging(bool enabled) {
+  tap_dragging_.Set(enabled);
+}
+
+bool TouchpadSettings::GetTapDragging() const {
+  return tap_dragging_.value();
+}
+
+bool TouchpadSettings::Update(const TouchpadSettings& settings,
+                              std::vector<std::string>* argv) {
+  if (argv)
+    argv->push_back(kTpControl);
+  bool updated = false;
+  if (sensitivity_.Update(settings.sensitivity_)) {
+    updated = true;
+    if (argv)
+      AddSensitivityArguments(sensitivity_.value(), argv);
+  }
+  if (tap_to_click_.Update(settings.tap_to_click_)) {
+    updated = true;
+    if (argv)
+      AddTPControlArguments("taptoclick", tap_to_click_.value(), argv);
+  }
+  if (three_finger_click_.Update(settings.three_finger_click_)) {
+    updated = true;
+    if (argv)
+      AddTPControlArguments("t5r2_three_finger_click",
+                            three_finger_click_.value(),
+                            argv);
+  }
+  if (tap_dragging_.Update(settings.tap_dragging_)) {
+    updated = true;
+    if (argv)
+      AddTPControlArguments("tap_dragging", tap_dragging_.value(), argv);
+  }
+  return updated;
+}
+
+MouseSettings::MouseSettings() {}
+
+MouseSettings& MouseSettings::operator=(const MouseSettings& other) {
+  if (&other != this) {
+    sensitivity_ = other.sensitivity_;
+    primary_button_right_ = other.primary_button_right_;
+  }
+  return *this;
+}
+
+void MouseSettings::SetSensitivity(int value) {
+  sensitivity_.Set(value);
+}
+
+int MouseSettings::GetSensitivity() const {
+  return sensitivity_.value();
+}
+
+void MouseSettings::SetPrimaryButtonRight(bool right) {
+  primary_button_right_.Set(right);
+}
+
+bool MouseSettings::GetPrimaryButtonRight() const {
+  return primary_button_right_.value();
+}
+
+bool MouseSettings::Update(const MouseSettings& settings,
+                           std::vector<std::string>* argv) {
+  if (argv)
+    argv->push_back(kMouseControl);
+  bool updated = false;
+  if (sensitivity_.Update(settings.sensitivity_)) {
+    updated = true;
+    if (argv)
+      AddSensitivityArguments(sensitivity_.value(), argv);
+  }
+  if (primary_button_right_.Update(settings.primary_button_right_)) {
+    updated = true;
+    if (argv) {
+      argv->push_back("swap_left_right");
+      argv->push_back(settings.GetPrimaryButtonRight() ? "1" : "0");
+    }
+  }
+  return updated;
+}
+
+// static
+InputDeviceSettings* InputDeviceSettings::Get() {
+  if (g_test_instance_)
+    return g_test_instance_;
+  if (!g_instance_)
+    g_instance_ = new InputDeviceSettingsImpl;
+  return g_instance_;
+}
+
+// static
+void InputDeviceSettings::SetSettingsForTesting(
+    InputDeviceSettings* test_settings) {
+  if (g_test_instance_ == test_settings)
+    return;
+  delete g_test_instance_;
+  g_test_instance_ = test_settings;
+}
 
 }  // namespace system
 }  // namespace chromeos

chrome/browser/chromeos/system/input_device_settings.h

@@ -5,57 +5,199 @@
 #ifndef CHROME_BROWSER_CHROMEOS_SYSTEM_INPUT_DEVICE_SETTINGS_H_
 #define CHROME_BROWSER_CHROMEOS_SYSTEM_INPUT_DEVICE_SETTINGS_H_
 
+#include <string>
+#include <vector>
+
 #include "base/callback.h"
+#include "base/logging.h"
 
 namespace chromeos {
 namespace system {
 
+namespace internal {
+
+// Objects of this class are intended to store values of type T, but might have
+// "unset" state. Object will be in "unset" state until Set is called first
+// time.
+template <typename T>
+class Optional {
+ public:
+  Optional()
+    : value_(),
+      is_set_(false) {
+  }
+
+  Optional& operator=(const Optional& other) {
+    if (&other != this) {
+      value_ = other.value_;
+      is_set_ = other.is_set_;
+    }
+    return *this;
+  }
+
+  void Set(const T& value) {
+    is_set_ = true;
+    value_ = value;
+  }
+
+  bool is_set() const {
+    return is_set_;
+  }
+
+  T value() const {
+    DCHECK(is_set());
+    return value_;
+  }
+
+  // Tries to update |this| with |update|. If |update| is unset or has same
+  // value as |this| method returns false. Otherwise |this| takes value of
+  // |update| and returns true.
+  bool Update(const Optional& update) {
+    if (update.is_set_ && (!is_set_ || value_ != update.value_)) {
+      value_ = update.value_;
+      is_set_ = true;
+      return true;
+    }
+    return false;
+  }
+
+ private:
+  T value_;
+  bool is_set_;
+};
+
+}  // namespace internal
+
 // Min/max possible pointer sensitivity values. Defined in CrOS inputcontrol
 // scripts (see kTpControl/kMouseControl in the source file).
 const int kMinPointerSensitivity = 1;
 const int kMaxPointerSensitivity = 5;
 
-typedef base::Callback<void(bool)> DeviceExistsCallback;
-
-namespace touchpad_settings {
-
-// Calls |callback| asynchronously after determining if a touchpad is connected.
-void TouchpadExists(const DeviceExistsCallback& callback);
-
-// Sets the touchpad sensitivity in the range [1, 5].
-void SetSensitivity(int value);
-
-// Turns tap to click on/off.
-void SetTapToClick(bool enabled);
-
-// Switch for three-finger click.
-void SetThreeFingerClick(bool enabled);
-
-// Turns tap-dragging on/off.
-void SetTapDragging(bool enabled);
-
-}  // namespace touchpad_settings
-
-namespace mouse_settings {
-
-// Calls |callback| asynchronously after determining if a mouse is connected.
-void MouseExists(const DeviceExistsCallback& callback);
-
-// Sets the mouse sensitivity in the range [1, 5].
-void SetSensitivity(int value);
-
-// Sets the primary mouse button to the right button if |right| is true.
-void SetPrimaryButtonRight(bool right);
-
-}  // namespace mouse_settings
-
-namespace keyboard_settings {
-
-// Returns true if UI should implement enhanced keyboard support for cases where
-// other input devices like mouse are absent.
-bool ForceKeyboardDrivenUINavigation();
-
-}  // namespace keyboard_settings
+// Auxiliary class used to update several touchpad settings at a time. User
+// should set any number of settings and pass object to UpdateTouchpadSettings
+// method of InputDeviceSettings.
+// Objects of this class have no default values for settings, so it is error
+// to call Get* method before calling corresponding Set* method at least
+// once.
+class TouchpadSettings {
+ public:
+  TouchpadSettings();
+  TouchpadSettings& operator=(const TouchpadSettings& other);
+
+  void SetSensitivity(int value);
+  int GetSensitivity() const;
+
+  void SetTapToClick(bool enabled);
+  bool GetTapToClick() const;
+
+  void SetThreeFingerClick(bool enabled);
+  bool GetThreeFingerClick() const;
+
+  void SetTapDragging(bool enabled);
+  bool GetTapDragging() const;
+
+  // Updates |this| with |settings|. If at least one setting was updated returns
+  // true.
+  // |argv| is filled with arguments of script, that should be launched in order
+  // to apply update. This argument is optional and could be NULL.
+  bool Update(const TouchpadSettings& settings, std::vector<std::string>* argv);
+
+ private:
+  internal::Optional<int> sensitivity_;
+  internal::Optional<bool> tap_to_click_;
+  internal::Optional<bool> three_finger_click_;
+  internal::Optional<bool> tap_dragging_;
+};
+
+// Auxiliary class used to update several mouse settings at a time. User
+// should set any number of settings and pass object to UpdateMouseSettings
+// method of InputDeviceSettings.
+// Objects of this class have no default values for settings, so it is error
+// to call Get* method before calling corresponding Set* method at least
+// once.
+class MouseSettings {
+ public:
+  MouseSettings();
+  MouseSettings& operator=(const MouseSettings& other);
+
+  void SetSensitivity(int value);
+  int GetSensitivity() const;
+
+  void SetPrimaryButtonRight(bool right);
+  bool GetPrimaryButtonRight() const;
+
+  // Updates |this| with |settings|. If at least one setting was updated returns
+  // true.
+  // |argv| is filled with arguments of script, that should be launched in order
+  // to apply update. This argument is optional and could be NULL.
+  bool Update(const MouseSettings& update, std::vector<std::string>* argv);
+
+ private:
+  internal::Optional<int> sensitivity_;
+  internal::Optional<bool> primary_button_right_;
+};
+
+class InputDeviceSettings {
+ public:
+  typedef base::Callback<void(bool)> DeviceExistsCallback;
+
+  virtual ~InputDeviceSettings() {}
+
+  // Returns current instance of InputDeviceSettings.
+  static InputDeviceSettings* Get();
+
+  // Replaces current instance with |test_settings|. Takes ownership of
+  // |test_settings|. Default implementation could be returned back by passing
+  // NULL to this method.
+  static void SetSettingsForTesting(InputDeviceSettings* test_settings);
+
+  // Calls |callback| asynchronously after determining if a touchpad is
+  // connected.
+  virtual void TouchpadExists(const DeviceExistsCallback& callback) = 0;
+
+  // Updates several touchpad settings at a time. Updates only settings that
+  // are set in |settings| object. It is more efficient to use this method to
+  // update several settings then calling Set* methods one by one.
+  virtual void UpdateTouchpadSettings(const TouchpadSettings& settings) = 0;
+
+  // Sets the touchpad sensitivity in the range [kMinPointerSensitivity,
+  // kMaxPointerSensitivity].
+  virtual void SetTouchpadSensitivity(int value) = 0;
+
+  // Turns tap to click on/off.
+  virtual void SetTapToClick(bool enabled) = 0;
+
+  // Switch for three-finger click.
+  virtual void SetThreeFingerClick(bool enabled) = 0;
+
+  // Turns tap-dragging on/off.
+  virtual void SetTapDragging(bool enabled) = 0;
+
+  // Calls |callback| asynchronously after determining if a mouse is connected.
+  virtual void MouseExists(const DeviceExistsCallback& callback) = 0;
+
+  // Updates several mouse settings at a time. Updates only settings that
+  // are set in |settings| object. It is more efficient to use this method to
+  // update several settings then calling Set* methods one by one.
+  virtual void UpdateMouseSettings(const MouseSettings& settings) = 0;
+
+  // Sets the mouse sensitivity in the range [kMinPointerSensitivity,
+  // kMaxPointerSensitivity].
+  virtual void SetMouseSensitivity(int value) = 0;
+
+  // Sets the primary mouse button to the right button if |right| is true.
+  virtual void SetPrimaryButtonRight(bool right) = 0;
+
+  // Returns true if UI should implement enhanced keyboard support for cases
+  // where other input devices like mouse are absent.
+  virtual bool ForceKeyboardDrivenUINavigation() = 0;
+
+  // Reapplies previously set touchpad settings.
+  virtual void ReapplyTouchpadSettings() = 0;
+
+  // Reapplies previously set mouse settings.
+  virtual void ReapplyMouseSettings() = 0;
+};
 
 }  // namespace system
 }  // namespace chromeos

chrome/browser/chromeos/system/pointer_device_observer.cc

@@ -48,13 +48,13 @@ void PointerDeviceObserver::DeviceHierarchyChanged() {
 }
 
 void PointerDeviceObserver::CheckTouchpadExists() {
-  touchpad_settings::TouchpadExists(
+  InputDeviceSettings::Get()->TouchpadExists(
       base::Bind(&PointerDeviceObserver::OnTouchpadExists,
                  weak_factory_.GetWeakPtr()));
 }
 
 void PointerDeviceObserver::CheckMouseExists() {
-  mouse_settings::MouseExists(
+  InputDeviceSettings::Get()->MouseExists(
       base::Bind(&PointerDeviceObserver::OnMouseExists,
                  weak_factory_.GetWeakPtr()));
 }

chrome/browser/extensions/signin/gaia_auth_extension_loader.cc

@@ -61,10 +61,12 @@ void LoadGaiaAuthExtension(Profile* profile) {
   }
 
   int manifest_resource_id = IDR_GAIA_AUTH_MANIFEST;
-  if (chromeos::system::keyboard_settings::ForceKeyboardDrivenUINavigation())
+  if (chromeos::system::InputDeviceSettings::Get()
+          ->ForceKeyboardDrivenUINavigation()) {
     manifest_resource_id = IDR_GAIA_AUTH_KEYBOARD_MANIFEST;
-  else if (!command_line->HasSwitch(chromeos::switches::kDisableSamlSignin))
+  } else if (!command_line->HasSwitch(chromeos::switches::kDisableSamlSignin)) {
     manifest_resource_id = IDR_GAIA_AUTH_SAML_MANIFEST;
+  }
 #else
   int manifest_resource_id = IDR_GAIA_AUTH_INLINE_MANIFEST;
 #endif

chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc

@@ -300,7 +300,7 @@ void CoreOobeHandler::UpdateOobeUIVisibility() {
   }
   CallJS("showVersion", should_show_version);
   CallJS("showOobeUI", show_oobe_ui_);
-  if (system::keyboard_settings::ForceKeyboardDrivenUINavigation())
+  if (system::InputDeviceSettings::Get()->ForceKeyboardDrivenUINavigation())
     CallJS("enableKeyboardFlow", true);
 }
 

chrome/browser/ui/webui/chromeos/login/network_screen_handler.cc

@@ -127,7 +127,7 @@ void NetworkScreenHandler::EnableContinue(bool enabled) {
 
 void NetworkScreenHandler::DeclareLocalizedValues(
     LocalizedValuesBuilder* builder) {
-  if (system::keyboard_settings::ForceKeyboardDrivenUINavigation())
+  if (system::InputDeviceSettings::Get()->ForceKeyboardDrivenUINavigation())
     builder->Add("networkScreenGreeting", IDS_REMORA_CONFIRM_MESSAGE);
   else
     builder->Add("networkScreenGreeting", IDS_WELCOME_SCREEN_GREETING);

chrome/browser/ui/webui/chromeos/login/oobe_ui.cc

@@ -375,7 +375,7 @@ void OobeUI::GetLocalizedStrings(base::DictionaryValue* localized_strings) {
   }
 
   bool keyboard_driven_oobe =
-      system::keyboard_settings::ForceKeyboardDrivenUINavigation();
+      system::InputDeviceSettings::Get()->ForceKeyboardDrivenUINavigation();
   localized_strings->SetString("highlightStrength",
                                keyboard_driven_oobe ? "strong" : "normal");
 

chrome/browser/ui/webui/chromeos/proxy_settings_ui.cc

@@ -100,7 +100,7 @@ ProxySettingsUI::ProxySettingsUI(content::WebUI* web_ui)
   proxy_handler_->GetLocalizedValues(localized_strings);
 
   bool keyboard_driven_oobe =
-      system::keyboard_settings::ForceKeyboardDrivenUINavigation();
+      system::InputDeviceSettings::Get()->ForceKeyboardDrivenUINavigation();
   localized_strings->SetString("highlightStrength",
                                keyboard_driven_oobe ? "strong" : "normal");
 

chrome/browser/ui/webui/options/chromeos/proxy_handler.cc

@@ -69,7 +69,7 @@ void ProxyHandler::InitializePage() {
   ::options::OptionsPageUIHandler::InitializePage();
 
   bool keyboard_driven_oobe =
-      system::keyboard_settings::ForceKeyboardDrivenUINavigation();
+      system::InputDeviceSettings::Get()->ForceKeyboardDrivenUINavigation();
   if (keyboard_driven_oobe) {
     web_ui()->CallJavascriptFunction(
         "DetailsInternetPage.initializeKeyboardFlow");

chrome/chrome_tests_unit.gypi

@@ -110,6 +110,8 @@
         'browser/chromeos/settings/device_settings_test_helper.h',
         'browser/chromeos/settings/mock_owner_key_util.cc',
         'browser/chromeos/settings/mock_owner_key_util.h',
+        'browser/chromeos/system/fake_input_device_settings.cc',
+        'browser/chromeos/system/fake_input_device_settings.h',
         # The only thing used from browser is Browser::Type.
         'browser/download/download_test_file_activity_observer.cc',
         'browser/download/download_test_file_activity_observer.h',