Add flow control between renderer and GPU processes, and, on Mac OS X,...

chrome/gpu/gpu_thread.cc

Index: chrome/gpu/gpu_thread.cc
===================================================================
--- chrome/gpu/gpu_thread.cc	(revision 67289)
+++ chrome/gpu/gpu_thread.cc	(working copy)
@@ -61,6 +61,10 @@
                         OnSynchronize)
     IPC_MESSAGE_HANDLER(GpuMsg_CollectGraphicsInfo,
                         OnCollectGraphicsInfo)
+#if defined(OS_MACOSX)
+    IPC_MESSAGE_HANDLER(GpuMsg_AcceleratedSurfaceBuffersSwappedACK,
+                        OnAcceleratedSurfaceBuffersSwappedACK)
+#endif
     IPC_MESSAGE_HANDLER(GpuMsg_Crash,
                         OnCrash)
     IPC_MESSAGE_HANDLER(GpuMsg_Hang,
@@ -107,6 +111,17 @@
   Send(new GpuHostMsg_GraphicsInfoCollected(gpu_info_));
 }
 
+#if defined(OS_MACOSX)
+void GpuThread::OnAcceleratedSurfaceBuffersSwappedACK(
+    int renderer_id, int32 route_id, uint64 swap_buffers_count) {
+  GpuChannelMap::const_iterator iter = gpu_channels_.find(renderer_id);
+  if (iter == gpu_channels_.end())
+    return;
+  scoped_refptr<GpuChannel> channel = iter->second;
+  channel->AcceleratedSurfaceBuffersSwapped(route_id, swap_buffers_count);
+}
+#endif
+
 void GpuThread::OnCrash() {
   // Good bye, cruel world.
   volatile int* it_s_the_end_of_the_world_as_we_know_it = NULL;