[Mac] Rubber-banding on Lion.

content/common/view_messages.h

 // Copyright (c) 2011 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 "content/common/common_param_traits.h"
@@ skipping 609 matching lines @@
   // The regions of the bitmap (in view coords) that contain updated pixels.
   // In the case of scrolling, this includes the scroll damage rect.
   IPC_STRUCT_MEMBER(std::vector<gfx::Rect>, copy_rects)
 
   // The size of the RenderView when this message was generated.  This is
   // included so the host knows how large the view is from the perspective of
   // the renderer process.  This is necessary in case a resize operation is in
   // progress.
   IPC_STRUCT_MEMBER(gfx::Size, view_size)
 
+  // The size of the web content area.
+  IPC_STRUCT_MEMBER(gfx::Size, contents_size)
+
   // The area of the RenderView reserved for resize corner when this message
   // was generated.  Reported for the same reason as view_size is.
   IPC_STRUCT_MEMBER(gfx::Rect, resizer_rect)
 
   // New window locations for plugin child windows.
   IPC_STRUCT_MEMBER(std::vector<webkit::npapi::WebPluginGeometry>,
                     plugin_window_moves)
 
   // The following describes the various bits that may be set in flags:
   //
   //   ViewHostMsg_UpdateRect_Flags::IS_RESIZE_ACK
   //     Indicates that this is a response to a ViewMsg_Resize message.
   //
   //   ViewHostMsg_UpdateRect_Flags::IS_RESTORE_ACK
   //     Indicates that this is a response to a ViewMsg_WasRestored message.
   //
   //   ViewHostMsg_UpdateRect_Flags::IS_REPAINT_ACK
   //     Indicates that this is a response to a ViewMsg_Repaint message.
   //
-  // If flags is zero, then this message corresponds to an unsoliticed paint
+  // If flags is zero, then this message corresponds to an unsolicited paint
   // request by the render view.  Any of the above bits may be set in flags,
   // which would indicate that this paint message is an ACK for multiple
   // request messages.
   IPC_STRUCT_MEMBER(int, flags)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(ViewMsg_SwapOut_Params)
   // The identifier of the RenderProcessHost for the currently closing view.
   //
   // These first two parameters are technically redundant since they are
@@ skipping 1392 matching lines @@
                     int32 /* complete status */)
 
 // Request updated information about the client firewall traversal policy.
 // Will result in a ViewMsg_UpdateRemoteAccessClientFirewallTraversal message
 // being sent back.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_RequestRemoteAccessClientFirewallTraversal)
 
 // Notifies the browser of an event occurring in the media pipeline.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_MediaLogEvent,
                      media::MediaLogEvent /* event */)