Send the device scale factor from Windows 8 ASH during initialization via the MetroViewerHostMsg_Se…

ui/aura/remote_window_tree_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_WINDOW_TREE_HOST_WIN_H_
 #define UI_AURA_REMOTE_WINDOW_TREE_HOST_WIN_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 102 matching lines @@
 
   // Manually sets the instance to be used as a return value of |Instance()|
   // method above. This should not be called if the instance has already
   // been set or created, and doing so will result in CHECK failure.
   static void SetInstance(RemoteWindowTreeHostWin* instance);
 
   // Returns true if there is a RemoteWindowTreeHostWin and it has a valid
   // HWND. A return value of false typically indicates we're not in metro mode.
   static bool IsValid();
 
-  // Sets the handle to the remote window. The |remote_window| is the actual
-  // window owned by the viewer process. Call this before Connected() for some
-  // customers like input method initialization which needs the handle.
-  void SetRemoteWindowHandle(HWND remote_window);
+  // Sets the handle to the remote window and the scale factor. The
+  // |remote_window| is the actual window owned by the viewer process. Call
+  // this before Connected() for some customers like input method
+  // initialization which needs the handle.
+  // |device_scale| indicates the Windows 8 dpi scale.
+  void InitializeRemoteWindowAndScaleFactor(HWND remote_window,
+                                            float device_scale);
 
   // The |host| can be used when we need to send a message to it.
   void Connected(IPC::Sender* host);
   // 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 HandleOpenURLOnDesktop(const base::FilePath& shortcut,
@@ skipping 162 matching lines @@
 
   // Current size of this root window.
   gfx::Size window_size_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteWindowTreeHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_REMOTE_WINDOW_TREE_HOST_WIN_H_