X11: Add TestDesktopScreenX11 to simulate mouse movement in ui tests

BUG=640741

Review-Url: https://codereview.chromium.org/2327623002
Cr-Commit-Position: refs/heads/master@{#417978}

chrome/browser/ui/views/chrome_browser_main_extra_parts_views.cc

@@ -45,6 +45,8 @@ void ChromeBrowserMainExtraPartsViews::ToolkitInitialized() {
 
 void ChromeBrowserMainExtraPartsViews::PreCreateThreads() {
 #if defined(USE_AURA) && !defined(OS_CHROMEOS)
+  // The screen may have already been set in test initialization.
+  if (!display::Screen::GetScreen())
     display::Screen::SetScreenInstance(views::CreateDesktopScreen());
 #endif
 }

chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc

@@ -673,15 +673,9 @@ void DragToSeparateWindowStep2(DetachToBrowserTabDragControllerTest* test,
 
 }  // namespace
 
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-// TODO: Disabled as mouse isn't updated propertly, http://crbug.com/640741.
-#define MAYBE_DragToSeparateWindow DISABLED_DragToSeparateWindow
-#else
-#define MAYBE_DragToSeparateWindow DragToSeparateWindow
-#endif
 // Creates two browsers, drags from first into second.
 IN_PROC_BROWSER_TEST_P(DetachToBrowserTabDragControllerTest,
-                       MAYBE_DragToSeparateWindow) {
+                       DragToSeparateWindow) {
   TabStrip* tab_strip = GetTabStripForBrowser(browser());
 
   // Add another tab to browser().

chrome/test/base/in_process_browser_test.cc

@@ -86,6 +86,10 @@
 #include "chrome/test/base/default_ash_event_generator_delegate.h"
 #endif
 
+#if !defined(OS_CHROMEOS) && defined(OS_LINUX)
+#include "ui/views/test/test_desktop_screen_x11.h"
+#endif
+
 namespace {
 
 // Passed as value of kTestType.
@@ -222,7 +226,11 @@ void InProcessBrowserTest::SetUp() {
     command_line->AppendSwitchASCII(switches::kHostWindowBounds,
                                     "0+0-1280x800");
   }
-#endif  // defined(OS_CHROMEOS)
+#elif defined(OS_LINUX)
+  DCHECK(!display::Screen::GetScreen());
+  display::Screen::SetScreenInstance(
+      views::test::TestDesktopScreenX11::GetInstance());
+#endif
 
   // Always use a mocked password storage if OS encryption is used (which is
   // when anything sensitive gets stored, including Cookies). Without this on

chrome/test/base/view_event_test_platform_part_default.cc

@@ -10,6 +10,10 @@
 #include "ui/display/screen.h"
 #include "ui/views/widget/desktop_aura/desktop_screen.h"
 
+#if !defined(OS_CHROMEOS) && defined(OS_LINUX)
+#include "ui/views/test/test_desktop_screen_x11.h"
+#endif
+
 namespace {
 
 // ViewEventTestPlatformPart implementation for Views, but non-CrOS.
@@ -18,8 +22,14 @@ class ViewEventTestPlatformPartDefault : public ViewEventTestPlatformPart {
   explicit ViewEventTestPlatformPartDefault(
       ui::ContextFactory* context_factory) {
 #if defined(USE_AURA)
+    DCHECK(!display::Screen::GetScreen());
+#if !defined(OS_CHROMEOS) && defined(OS_LINUX)
+    display::Screen::SetScreenInstance(
+        views::test::TestDesktopScreenX11::GetInstance());
+#else
     screen_.reset(views::CreateDesktopScreen());
     display::Screen::SetScreenInstance(screen_.get());
+#endif
     env_ = aura::Env::CreateInstance();
     env_->set_context_factory(context_factory);
 #endif

ui/views/BUILD.gn

@@ -756,6 +756,8 @@ static_library("test_support_internal") {
       sources += [
         "test/desktop_screen_x11_test_api.cc",
         "test/desktop_screen_x11_test_api.h",
+        "test/test_desktop_screen_x11.cc",
+        "test/test_desktop_screen_x11.h",
         "test/ui_controls_factory_desktop_aurax11.cc",
         "test/ui_controls_factory_desktop_aurax11.h",
       ]

ui/views/test/test_desktop_screen_x11.cc

+// Copyright 2016 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 "ui/views/test/test_desktop_screen_x11.h"
+
+#include "base/memory/singleton.h"
+
+namespace views {
+namespace test {
+
+TestDesktopScreenX11* TestDesktopScreenX11::GetInstance() {
+  return base::Singleton<TestDesktopScreenX11>::get();
+}
+
+TestDesktopScreenX11::TestDesktopScreenX11() {}
+
+TestDesktopScreenX11::~TestDesktopScreenX11() {}
+
+gfx::Point TestDesktopScreenX11::GetCursorScreenPoint() {
+  return cursor_screen_point_;
+}
+
+TestDesktopScreenX11* GetTestDesktopScreenX11() {
+  static std::unique_ptr<TestDesktopScreenX11> test_screen_instance;
+  if (!test_screen_instance.get())
+    test_screen_instance.reset(new TestDesktopScreenX11());
+  return test_screen_instance.get();
+}
+
+}  // namespace test
+}  // namespace views

ui/views/test/test_desktop_screen_x11.h

+// Copyright 2016 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 UI_VIEWS_TEST_TEST_DESKTOP_SCREEN_X11_H_
+#define UI_VIEWS_TEST_TEST_DESKTOP_SCREEN_X11_H_
+
+#include "ui/gfx/geometry/point.h"
+#include "ui/views/widget/desktop_aura/desktop_screen_x11.h"
+
+namespace base {
+template<typename T> struct DefaultSingletonTraits;
+}
+
+namespace views {
+namespace test {
+
+// Replaces the screen instance in Linux (non-ChromeOS) tests.  Allows
+// aura tests to manually set the cursor screen point to be reported
+// by GetCursorScreenPoint().  Needed because of a limitation in the
+// X11 protocol that restricts us from warping the pointer with the
+// mouse button held down.
+class TestDesktopScreenX11 : public DesktopScreenX11 {
+ public:
+  static TestDesktopScreenX11* GetInstance();
+
+  TestDesktopScreenX11();
+  ~TestDesktopScreenX11() override;
+
+  // DesktopScreenX11:
+  gfx::Point GetCursorScreenPoint() override;
+
+  void set_cursor_screen_point(const gfx::Point& point) {
+    cursor_screen_point_ = point;
+  }
+
+ private:
+  friend struct base::DefaultSingletonTraits<TestDesktopScreenX11>;
+
+  gfx::Point cursor_screen_point_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestDesktopScreenX11);
+};
+
+}  // namespace test
+}  // namespace views
+
+#endif  // UI_VIEWS_TEST_TEST_DESKTOP_SCREEN_X11_H_

ui/views/test/ui_controls_factory_desktop_aurax11.cc

@@ -25,6 +25,7 @@
 #include "ui/events/keycodes/keyboard_code_conversion_x.h"
 #include "ui/events/test/platform_event_waiter.h"
 #include "ui/gfx/x/x11_connection.h"
+#include "ui/views/test/test_desktop_screen_x11.h"
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 namespace views {
@@ -145,6 +146,10 @@ class UIControlsDesktopX11 : public UIControlsAura {
         aura::test::QueryLatestMousePositionRequestInHost(host);
     host->ConvertPointFromHost(&root_current_location);
 
+    auto screen = views::test::TestDesktopScreenX11::GetInstance();
+    DCHECK_EQ(screen, display::Screen::GetScreen());
+    screen->set_cursor_screen_point(gfx::Point(screen_x, screen_y));
+
     if (root_location != root_current_location && button_down_mask == 0) {
       // Move the cursor because EnterNotify/LeaveNotify are generated with the
       // current mouse position as a result of XGrabPointer()