Add chrome.inputMethodPrivate.hideInputView()

This CL adds a method to explicitly close the virtual keyboard.
It will be used from Tast's Chrome ResetState function.

Tast side CL: https://crrev.com/c/2071552

TEST=tast run arc.ChromeVirtualKeyboard
BUG=None

Change-Id: Iffb9fb1f9b9e5059b38d3315f9d135d23624a479
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071549
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746227}

chrome/browser/chromeos/extensions/input_method_api.cc

@@ -81,6 +81,8 @@ namespace {
 const char kXkbPrefix[] = "xkb:";
 const char kErrorFailToShowInputView[] =
     "Unable to show the input view window because the keyboard is not enabled.";
+const char kErrorFailToHideInputView[] =
+    "Unable to hide the input view window because the keyboard is not enabled.";
 const char kErrorRouterNotAvailable[] = "The router is not available.";
 const char kErrorInvalidInputMethod[] = "Input method not found.";
 const char kErrorSpellCheckNotAvailable[] =
@@ -264,6 +266,17 @@ InputMethodPrivateShowInputViewFunction::Run() {
   return RespondNow(NoArguments());
 }
 
+ExtensionFunction::ResponseAction
+InputMethodPrivateHideInputViewFunction::Run() {
+  auto* keyboard_client = ChromeKeyboardControllerClient::Get();
+  if (!keyboard_client->is_keyboard_enabled()) {
+    return RespondNow(Error(kErrorFailToHideInputView));
+  }
+
+  keyboard_client->HideKeyboard(ash::HideReason::kUser);
+  return RespondNow(NoArguments());
+}
+
 ExtensionFunction::ResponseAction
 InputMethodPrivateOpenOptionsPageFunction::Run() {
   std::unique_ptr<OpenOptionsPage::Params> params(

chrome/browser/chromeos/extensions/input_method_api.h

@@ -171,6 +171,25 @@ class InputMethodPrivateShowInputViewFunction : public ExtensionFunction {
   DISALLOW_COPY_AND_ASSIGN(InputMethodPrivateShowInputViewFunction);
 };
 
+// Implements the inputMethodPrivate.hideInputView method.
+class InputMethodPrivateHideInputViewFunction : public ExtensionFunction {
+ public:
+  InputMethodPrivateHideInputViewFunction() = default;
+  InputMethodPrivateHideInputViewFunction(
+      const InputMethodPrivateHideInputViewFunction&) = delete;
+  InputMethodPrivateHideInputViewFunction& operator=(
+      const InputMethodPrivateHideInputViewFunction&) = delete;
+
+ protected:
+  ~InputMethodPrivateHideInputViewFunction() override {}
+
+  ResponseAction Run() override;
+
+ private:
+  DECLARE_EXTENSION_FUNCTION("inputMethodPrivate.hideInputView",
+                             INPUTMETHODPRIVATE_HIDEINPUTVIEW)
+};
+
 // Implements the inputMethodPrivate.openOptionsPage method.
 class InputMethodPrivateOpenOptionsPageFunction : public ExtensionFunction {
  public:

chrome/common/extensions/api/input_method_private.json

@@ -332,6 +332,19 @@
             "parameters": []
           }
         ]
+      }, {
+        "name": "hideInputView",
+        "type": "function",
+        "description": "Shows the input view window. If the input view window is already hidden, this function will do nothing.",
+        "parameters": [
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "description": "Called when the operation completes.",
+            "parameters": []
+          }
+        ]
       }, {
         "name": "openOptionsPage",
         "type": "function",

extensions/browser/extension_function_histogram_value.h

@@ -1512,6 +1512,7 @@ enum HistogramValue {
   WEBCAMPRIVATE_RESTORE_CAMERA_PRESET = 1449,
   WEBCAMPRIVATE_SET_CAMERA_PRESET = 1450,
   PASSWORDSPRIVATE_GETCOMPROMISEDCREDENTIALSINFO = 1451,
+  INPUTMETHODPRIVATE_HIDEINPUTVIEW = 1452,
   // Last entry: Add new entries above, then run:
   // python tools/metrics/histograms/update_extension_histograms.py
   ENUM_BOUNDARY

third_party/closure_compiler/externs/input_method_private.js

@@ -197,6 +197,13 @@ chrome.inputMethodPrivate.notifyImeMenuItemActivated = function(engineID, name)
  */
 chrome.inputMethodPrivate.showInputView = function(callback) {};
 
+/**
+ * Hides the input view window. If the input view window is already hidden, this
+ * function will do nothing.
+ * @param {function():void=} callback Called when the operation completes.
+ */
+chrome.inputMethodPrivate.hideInputView = function(callback) {};
+
 /**
  * Opens the options page for the input method extension. If the input method
  * does not have options, this function will do nothing.

tools/metrics/histograms/enums.xml

@@ -22380,6 +22380,7 @@ to ensure that the crash string is shown properly on the user-facing crash UI.
   <int value="1449" label="WEBCAMPRIVATE_RESTORE_CAMERA_PRESET"/>
   <int value="1450" label="WEBCAMPRIVATE_SET_CAMERA_PRESET"/>
   <int value="1451" label="PASSWORDSPRIVATE_GETCOMPROMISEDCREDENTIALSINFO"/>
+  <int value="1452" label="INPUTMETHODPRIVATE_HIDEINPUTVIEW"/>
 </enum>
 
 <enum name="ExtensionIconState">