Ozone: Avoid blocking in Swapbuffer Call.

content/common/gpu/client/command_buffer_proxy_impl.cc

Index: content/common/gpu/client/command_buffer_proxy_impl.cc
diff --git a/content/common/gpu/client/command_buffer_proxy_impl.cc b/content/common/gpu/client/command_buffer_proxy_impl.cc
index 336488373490b19452fc9b5372bd2b3f07e6443c..fd452f1ebb6666d8be3bd84ec25b10159be35f44 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.cc
+++ b/content/common/gpu/client/command_buffer_proxy_impl.cc
@@ -52,6 +52,8 @@ bool CommandBufferProxyImpl::OnMessageReceived(const IPC::Message& message) {
                         OnSignalSyncPointAck);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SwapBuffersCompleted,
                         OnSwapBuffersCompleted);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_PageFlipCompleted,
+                        OnPageFlipCompleted);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -202,6 +204,11 @@ void CommandBufferProxyImpl::SetSwapBuffersCompletionCallback(
   swap_buffers_completion_callback_ = callback;
 }
 
+void CommandBufferProxyImpl::SetPageFlipCompletionCallback(
+    const PageFlipCompletionCallback& callback) {
+  page_flip_completion_callback_ = callback;
+}
+
 void CommandBufferProxyImpl::WaitForTokenInRange(int32 start, int32 end) {
   TRACE_EVENT2("gpu",
                "CommandBufferProxyImpl::WaitForToken",
@@ -538,4 +545,10 @@ void CommandBufferProxyImpl::OnSwapBuffersCompleted(
   }
 }
 
+void CommandBufferProxyImpl::OnPageFlipCompleted() {
+  if (!page_flip_completion_callback_.is_null()) {
+    page_flip_completion_callback_.Run();

[brianderson, 2014/12/10 22:48:05]

It would be really nice to pipe latency_info along this path too. Can you put a
TODO here?

+  }
+}
+
 }  // namespace content