Add default shadow to keyboard window

ui/keyboard/keyboard_controller_proxy.h

 // 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.
 
 #ifndef UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_
 #define UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/common/media_stream_request.h"
+#include "ui/aura/window_observer.h"
 #include "ui/base/ime/text_input_type.h"
 #include "ui/keyboard/keyboard_export.h"
 
 namespace aura {
 class Window;
 }
 namespace content {
 class BrowserContext;
 class SiteInstance;
 class WebContents;
 }
 namespace gfx {
 class Rect;
 }
 namespace ui {
 class InputMethod;
 }
+namespace wm {
+class Shadow;
+}
 
 namespace keyboard {
 
 // A proxy used by the KeyboardController to get access to the virtual
 // keyboard window.
-class KEYBOARD_EXPORT KeyboardControllerProxy {
+class KEYBOARD_EXPORT KeyboardControllerProxy : public aura::WindowObserver {
  public:
   class TestApi {
    public:
     explicit TestApi(KeyboardControllerProxy* proxy) : proxy_(proxy) {}
 
     const content::WebContents* keyboard_contents() {
       return proxy_->keyboard_contents_.get();
     }
 
    private:
@@ skipping 58 matching lines @@
   // Gets the BrowserContext to use for creating the WebContents hosting the
   // keyboard.
   virtual content::BrowserContext* GetBrowserContext() = 0;
 
   // The implementation can choose to setup the WebContents before the virtual
   // keyboard page is loaded (e.g. install a WebContentsObserver).
   // SetupWebContents() is called right after creating the WebContents, before
   // loading the keyboard page.
   virtual void SetupWebContents(content::WebContents* contents);
 
+  // aura::WindowObserver overrides:
+  virtual void OnWindowBoundsChanged(aura::Window* window,
+                                     const gfx::Rect& old_bounds,
+                                     const gfx::Rect& new_bounds) OVERRIDE;
+  virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
+
  private:
   friend class TestApi;
 
   // Loads the web contents for the given |url|.
   void LoadContents(const GURL& url);
 
   // Gets the virtual keyboard URL (either the default URL or IME override URL).
   const GURL& GetVirtualKeyboardUrl();
 
   const GURL default_url_;
 
   scoped_ptr<content::WebContents> keyboard_contents_;
+  scoped_ptr<wm::Shadow> shadow_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardControllerProxy);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_