[Do not submit] D3DKMTWaitForVerticalBlankEvent VSync prototype

gpu/ipc/client/command_buffer_proxy_impl.cc

Index: gpu/ipc/client/command_buffer_proxy_impl.cc
diff --git a/gpu/ipc/client/command_buffer_proxy_impl.cc b/gpu/ipc/client/command_buffer_proxy_impl.cc
index 552f23b92d4c525cfa9202dacd73109b238c41a7..226cc26529a206328ed2fa4cdf3b7dd5067e3ca4 100644
--- a/gpu/ipc/client/command_buffer_proxy_impl.cc
+++ b/gpu/ipc/client/command_buffer_proxy_impl.cc
@@ -335,6 +335,15 @@ void CommandBufferProxyImpl::SetUpdateVSyncParametersCallback(
   update_vsync_parameters_completion_callback_ = callback;
 }
 
+void CommandBufferProxyImpl::EnableVSync(bool enabled) {
+  CheckLock();
+  base::AutoLock lock(last_state_lock_);
+  if (last_state_.error != gpu::error::kNoError)
+    return;
+
+  Send(new GpuCommandBufferMsg_EnableVSync(route_id_, enabled));
+}
+
 gpu::CommandBuffer::State CommandBufferProxyImpl::WaitForTokenInRange(
     int32_t start,
     int32_t end) {