Support plumbing LatencyInfo through the old software path.

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 550 matching lines @@
   // request messages.
   IPC_STRUCT_MEMBER(int, flags)
 
   // Whether or not the renderer expects a ViewMsg_UpdateRect_ACK for this
   // update. True for 2D painting, but false for accelerated compositing.
   IPC_STRUCT_MEMBER(bool, needs_ack)
 
   // All the above coordinates are in DIP. This is the scale factor needed
   // to convert them to pixels.
   IPC_STRUCT_MEMBER(float, scale_factor)
+
+  // The latency information for the frame. Only valid when accelerated
+  // compositing is disabled.
+  IPC_STRUCT_MEMBER(ui::LatencyInfo, latency_info)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(ViewMsg_Navigate_Params)
   // The page_id for this navigation, or -1 if it is a new navigation.  Back,
   // Forward, and Reload navigations should have a valid page_id.  If the load
   // succeeds, then this page_id will be reflected in the resultant
   // ViewHostMsg_FrameNavigate message.
   IPC_STRUCT_MEMBER(int32, page_id)
 
   // If page_id is -1, then pending_history_list_offset will also be -1.
@@ skipping 1752 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.