Remove using the Shell desktop Window when we don't have an acceleated widget.

ui/aura/remote_root_window_host_win.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 UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_
 #define UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 68 matching lines @@
 // metro viewer. The on failure callback is invoked on failure.
 AURA_EXPORT void HandleSelectFolder(const base::string16& title,
                                     const SelectFolderCompletion& on_success,
                                     const FileSelectionCanceled& on_failure);
 
 // RootWindowHost implementaton that receives events from a different
 // process. In the case of Windows this is the Windows 8 (aka Metro)
 // frontend process, which forwards input events to this class.
 class AURA_EXPORT RemoteRootWindowHostWin : public RootWindowHost {
  public:
+  // Returns the only RemoteRootWindowHostWin, if this is the first time
+  // this function is called, it will call Create() wiht empty bounds.
   static RemoteRootWindowHostWin* Instance();
   static RemoteRootWindowHostWin* Create(const gfx::Rect& bounds);
 
   // Called when the remote process has established its IPC connection.
-  // The |host| can be used when we need to send a message to it.
-  void Connected(IPC::Sender* host);
+  // The |host| can be used when we need to send a message to it and
+  // |remote_window| is the actual window owned by the viewer process.
+  void Connected(IPC::Sender* host, HWND remote_window);
   // Called when the remote process has closed its IPC connection.
   void Disconnected();
 
   // Called when we have a message from the remote process.
   bool OnMessageReceived(const IPC::Message& message);
 
   void HandleOpenFile(const base::string16& title,
                       const base::FilePath& default_path,
                       const base::string16& filter,
                       const OpenFileCompletion& on_success,
@@ skipping 91 matching lines @@
   // invocations we post a synthetic keyboard message directly into the message
   // loop. The dispatcher for the nested loop would then decide how this
   // message is routed.
   void DispatchKeyboardMessage(ui::EventType type,
                                uint32 vkey,
                                uint32 repeat_count,
                                uint32 scan_code,
                                uint32 flags,
                                bool is_character);
 
+  HWND remote_window_;
   RootWindowHostDelegate* delegate_;
   IPC::Sender* host_;
   scoped_ptr<ui::ViewProp> prop_;
 
   // Saved callbacks which inform the caller about the result of the open file/
   // save file/select operations.
   OpenFileCompletion file_open_completion_callback_;
   OpenMultipleFilesCompletion multi_file_open_completion_callback_;
   SaveFileCompletion file_saveas_completion_callback_;
   SelectFolderCompletion select_folder_completion_callback_;
   FileSelectionCanceled failure_callback_;
 
   // Set to true if we need to ignore mouse messages until the SetCursorPos
   // operation is acked by the viewer.
   bool ignore_mouse_moves_until_set_cursor_ack_;
 
   // Tracking last click event for synthetically generated mouse events.
   scoped_ptr<ui::MouseEvent> last_mouse_click_event_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteRootWindowHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_