Plumb physical backing size from RWHV to renderer CC.

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
@@ skipping 779 matching lines @@
 IPC_MESSAGE_ROUTED0(ViewMsg_TimezoneChange)
 
 // Tells the render view to close.
 IPC_MESSAGE_ROUTED0(ViewMsg_Close)
 
 // Tells the render view to change its size.  A ViewHostMsg_PaintRect message
 // is generated in response provided new_size is not empty and not equal to
 // the view's current size.  The generated ViewHostMsg_PaintRect message will
 // have the IS_RESIZE_ACK flag set. It also receives the resizer rect so that
 // we don't have to fetch it every time WebKit asks for it.
-IPC_MESSAGE_ROUTED3(ViewMsg_Resize,
+IPC_MESSAGE_ROUTED4(ViewMsg_Resize,
                     gfx::Size /* new_size */,
+                    gfx::Size /* physical_backing_size */,
                     gfx::Rect /* resizer_rect */,
                     bool /* is_fullscreen */)
 
 // Tells the render view that the resize rect has changed.
 IPC_MESSAGE_ROUTED1(ViewMsg_ChangeResizeRect,
                     gfx::Rect /* resizer_rect */)
 
 // Sent to inform the view that it was hidden.  This allows it to reduce its
 // resource utilization.
 IPC_MESSAGE_ROUTED0(ViewMsg_WasHidden)
@@ skipping 1610 matching lines @@
 // cached by the OS. Please see RenderMessageFilter::OnPreCacheFontCharacters
 // for details.
 IPC_SYNC_MESSAGE_CONTROL2_0(ViewHostMsg_PreCacheFontCharacters,
                             LOGFONT /* font_data */,
                             string16 /* characters */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.