Send vsync timebase updates to the browser compositor

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 f261597ac1ec9f051f7509be3ab450fbca2e9d70..138a8341162f3be0396afc9e5502749cb992d326 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.cc
+++ b/content/common/gpu/client/command_buffer_proxy_impl.cc
@@ -68,6 +68,7 @@ bool CommandBufferProxyImpl::OnMessageReceived(const IPC::Message& message) {
                         OnSetMemoryAllocation);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SignalSyncPointAck,
                         OnSignalSyncPointAck);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_UpdateVSyncTime, OnUpdateVSyncTime);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -134,6 +135,16 @@ void CommandBufferProxyImpl::OnSignalSyncPointAck(uint32 id) {
   callback.Run();
 }
 
+void CommandBufferProxyImpl::SetUpdateVSyncTimeCallback(
+    const base::Callback<void(int64)>& callback) {
+  update_vsync_time_callback_ = callback;
+}
+
+void CommandBufferProxyImpl::OnUpdateVSyncTime(int64 time) {
+  if (!update_vsync_time_callback_.is_null())
+    update_vsync_time_callback_.Run(time);
+}
+
 void CommandBufferProxyImpl::SetChannelErrorCallback(
     const base::Closure& callback) {
   channel_error_callback_ = callback;