Send FrameSwapMessageQueue's messages with a separate IPC

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 786 matching lines @@
                     float /* page_scale_factor */)
 
 // Updates the minimum/maximum allowed zoom percent for this tab from the
 // default values.  If |remember| is true, then the zoom setting is applied to
 // other pages in the site and is saved, otherwise it only applies to this
 // tab.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_UpdateZoomLimits,
                     int /* minimum_percent */,
                     int /* maximum_percent */)
 
-IPC_MESSAGE_ROUTED4(
-    ViewHostMsg_SwapCompositorFrame,
-    uint32_t /* compositor_frame_sink_id */,
-    cc::LocalSurfaceId /* local_surface_id */,
-    cc::CompositorFrame /* frame */,
-    std::vector<IPC::Message> /* messages_to_deliver_with_frame */)
+IPC_MESSAGE_ROUTED3(ViewHostMsg_SwapCompositorFrame,
+                    uint32_t /* compositor_frame_sink_id */,
+                    cc::LocalSurfaceId /* local_surface_id */,
+                    cc::CompositorFrame /* frame */)
+
+IPC_MESSAGE_ROUTED2(ViewHostMsg_FrameSwapMessages,
+                    uint32_t /* frame_token */,
+                    std::vector<IPC::Message> /* messages */)
 
 // Sent if the BeginFrame did not cause a SwapCompositorFrame (e.g. because no
 // updates were required or because it was aborted in the renderer).
 IPC_MESSAGE_ROUTED1(ViewHostMsg_BeginFrameDidNotSwap,
                     cc::BeginFrameAck /* ack */)
 
 // Send back a string to be recorded by UserMetrics.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_UserMetricsRecordAction,
                      std::string /* action */)
 
@@ skipping 69 matching lines @@
                     int /* y */)
 
 #elif defined(OS_MACOSX)
 // Receives content of a web page as plain text.
 IPC_MESSAGE_ROUTED1(ViewMsg_GetRenderedTextCompleted, std::string)
 #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.