Send FrameSwapMessageQueue's messages with a separate IPC

content/renderer/gpu/frame_swap_message_queue.cc

 // Copyright 2014 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.
 
 #include "content/renderer/gpu/frame_swap_message_queue.h"
 
 #include <algorithm>
 #include <limits>
 #include <memory>
 #include <utility>
@@ skipping 188 matching lines @@
 // static
 void FrameSwapMessageQueue::TransferMessages(
     std::vector<std::unique_ptr<IPC::Message>>* source,
     vector<IPC::Message>* dest) {
   for (const auto& msg : *source) {
     dest->push_back(*msg.get());
   }
   source->clear();
 }
 
+uint32_t FrameSwapMessageQueue::AllocateFrameToken() {
+  return ++last_used_frame_token_;
+}
+
 }  // namespace content