GPU Channel's now maintain a global order number for each processed IPC.

content/common/gpu/gpu_channel_manager.cc

 // 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.
 
 #include "content/common/gpu/gpu_channel_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 237 matching lines @@
 }
 
 bool GpuChannelManager::HandleMessagesScheduled() {
   for (auto& kv : gpu_channels_) {
     if (kv.second->handle_messages_scheduled())
       return true;
   }
   return false;
 }
 
-uint64 GpuChannelManager::MessagesProcessed() {
-  uint64 messages_processed = 0;
-  for (auto& kv : gpu_channels_)
-    messages_processed += kv.second->messages_processed();
-  return messages_processed;
+uint32_t GpuChannelManager::ProcessedOrderNumber() {
+  uint32_t processed_order_num = 0;
+  for (auto& kv : gpu_channels_) {
+    processed_order_num = std::max(processed_order_num,
+                                   kv.second->GetProcessedOrderNum());
+  }
+  return processed_order_num;
 }
 
 void GpuChannelManager::LoseAllContexts() {
-  for (auto& kv : gpu_channels_)
+  for (auto& kv : gpu_channels_) {
     kv.second->MarkAllContextsLost();
+  }
   task_runner_->PostTask(FROM_HERE,
                          base::Bind(&GpuChannelManager::OnLoseAllContexts,
                                     weak_factory_.GetWeakPtr()));
 }
 
 void GpuChannelManager::OnLoseAllContexts() {
   gpu_channels_.clear();
 }
 
 gfx::GLSurface* GpuChannelManager::GetDefaultOffscreenSurface() {
   if (!default_offscreen_surface_.get()) {
     default_offscreen_surface_ =
         gfx::GLSurface::CreateOffscreenGLSurface(gfx::Size());
   }
   return default_offscreen_surface_.get();
 }
 
 }  // namespace content