Fix race between DPI and window size

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 784 matching lines @@
 // This passes a set of webkit preferences down to the renderer.
 IPC_MESSAGE_ROUTED1(ViewMsg_UpdateWebPreferences,
                     WebPreferences)
 
 // Informs the renderer that the timezone has changed.
 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
+IPC_STRUCT_BEGIN(ViewMsg_Resize_Params)
+  IPC_STRUCT_MEMBER(WebKit::WebScreenInfo, screen_info)
+  IPC_STRUCT_MEMBER(gfx::Size, new_size)
+  IPC_STRUCT_MEMBER(gfx::Size, physical_backing_size)
+  IPC_STRUCT_MEMBER(float, overdraw_bottom_height)
+  IPC_STRUCT_MEMBER(gfx::Rect, resizer_rect)
+  IPC_STRUCT_MEMBER(bool, is_fullscreen)
+IPC_STRUCT_END()
+
+// Tells the render view to change its size.  A ViewHostMsg_UpdateRect 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
+// the view's current size.  The generated ViewHostMsg_UpdateRect 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_ROUTED5(ViewMsg_Resize,
-                    gfx::Size /* new_size */,
-                    gfx::Size /* physical_backing_size */,
-                    float /* overdraw_bottom_height */,
-                    gfx::Rect /* resizer_rect */,
-                    bool /* is_fullscreen */)
+IPC_MESSAGE_ROUTED1(ViewMsg_Resize,
+                    ViewMsg_Resize_Params /* params */);
 
 // 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)
 
 // Tells the render view that it is no longer hidden (see WasHidden), and the
 // render view is expected to respond with a full repaint if needs_repainting
-// is true.  In that case, the generated ViewHostMsg_PaintRect message will
+// is true.  In that case, the generated ViewHostMsg_UpdateRect message will
 // have the IS_RESTORE_ACK flag set.  If needs_repainting is false, then this
 // message does not trigger a message in response.
 IPC_MESSAGE_ROUTED1(ViewMsg_WasShown,
                     bool /* needs_repainting */)
 
 // Sent to inform the view that it was swapped out.  This allows the process to
 // exit if no other views are using it.
 IPC_MESSAGE_ROUTED0(ViewMsg_WasSwappedOut)
 
 // Sent to render the view into the supplied transport DIB, resize
@@ skipping 278 matching lines @@
 
 // Notifies the renderer that a paint is to be generated for the rectangle
 // passed in.
 IPC_MESSAGE_ROUTED1(ViewMsg_Repaint,
                     gfx::Size /* The view size to be repainted */)
 
 // Notification that a move or resize renderer's containing window has
 // started.
 IPC_MESSAGE_ROUTED0(ViewMsg_MoveOrResizeStarted)
 
-IPC_MESSAGE_ROUTED1(ViewMsg_ScreenInfoChanged,
-                    WebKit::WebScreenInfo /* screen_info */)
-
 IPC_MESSAGE_ROUTED2(ViewMsg_UpdateScreenRects,
                     gfx::Rect /* view_screen_rect */,
                     gfx::Rect /* window_screen_rect */)
 
 // Reply to ViewHostMsg_RequestMove, ViewHostMsg_ShowView, and
 // ViewHostMsg_ShowWidget to inform the renderer that the browser has
 // processed the move.  The browser may have ignored the move, but it finished
 // processing.  This is used because the renderer keeps a temporary cache of
 // the widget position while these asynchronous operations are in progress.
 IPC_MESSAGE_ROUTED0(ViewMsg_Move_ACK)
@@ skipping 1168 matching lines @@
 // Since the browser keeps handles to the allocated transport DIBs, this
 // message is sent to tell the browser that it may release them when the
 // renderer is finished with them.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_FreeTransportDIB,
                      TransportDIB::Id /* DIB id */)
 #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.