Updated the VK Tray button to properly remove visual activated state.

ash/shell_observer.h

 // Copyright (c) 2012 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 ASH_SHELL_OBSERVER_H_
 #define ASH_SHELL_OBSERVER_H_
 
 #include "ash/ash_export.h"
 #include "ash/login_status.h"
 
@@ skipping 45 matching lines @@
   virtual void OnMaximizeModeEnding() {}
 
   // Called when the maximize mode has ended. Windows may still be
   // animating but have been restored.
   virtual void OnMaximizeModeEnded() {}
 
   // Called when keyboard is activated/deactivated in |root_window|.
   virtual void OnVirtualKeyboardStateChanged(bool activated,
                                              aura::Window* root_window) {}
 
+  // Called when a new KeyboardController is created.
+  virtual void OnKeyboardControllerCreated() {}
+
   // Called at the end of Shell::Init.
   virtual void OnShellInitialized() {}
 
  protected:
   virtual ~ShellObserver() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_OBSERVER_H_