Add action for each button on opt-in IME menu.

chrome/browser/ui/ash/chrome_keyboard_ui.cc

 // Copyright (c) 2013 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/ui/ash/chrome_keyboard_ui.h"
 
 #include <utility>
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/root_window_controller.h"
@@ skipping 87 matching lines @@
     event_args->Append(new_bounds.release());
 
     std::unique_ptr<extensions::Event> event(new extensions::Event(
         extensions::events::VIRTUAL_KEYBOARD_PRIVATE_ON_BOUNDS_CHANGED,
         virtual_keyboard_private::OnBoundsChanged::kEventName,
         std::move(event_args)));
     event->restrict_to_browser_context = context_;
     router->BroadcastEvent(std::move(event));
   }
 
+  void OnKeyboardHidden() override {}
+
  private:
   content::BrowserContext* context_;
 
   DISALLOW_COPY_AND_ASSIGN(AshKeyboardControllerObserver);
 };
 
 }  // namespace
 
 ChromeKeyboardUI::ChromeKeyboardUI(content::BrowserContext* context)
     : keyboard::KeyboardUIContent(context) {}
@@ skipping 102 matching lines @@
   event_args->Append(input_context.release());
 
   std::unique_ptr<extensions::Event> event(new extensions::Event(
       extensions::events::VIRTUAL_KEYBOARD_PRIVATE_ON_TEXT_INPUT_BOX_FOCUSED,
       virtual_keyboard_private::OnTextInputBoxFocused::kEventName,
       std::move(event_args)));
   event->restrict_to_browser_context = browser_context();
   router->DispatchEventToExtension(kVirtualKeyboardExtensionID,
                                    std::move(event));
 }