Added method to synchronize command buffers within GpuControl.

gpu/command_buffer/client/client_test_helper.h

Index: gpu/command_buffer/client/client_test_helper.h
diff --git a/gpu/command_buffer/client/client_test_helper.h b/gpu/command_buffer/client/client_test_helper.h
index 994dff5371e2e7f89972a1c6a18cb5dae3bbaaf2..8ec6c39d71cb5ae3d7e05ed266b122d51aad8fd9 100644
--- a/gpu/command_buffer/client/client_test_helper.h
+++ b/gpu/command_buffer/client/client_test_helper.h
@@ -118,6 +118,7 @@ class MockClientGpuControl : public GpuControl {
   MOCK_METHOD1(CreateStreamTexture, uint32_t(uint32_t));
   MOCK_METHOD1(SetLock, void(base::Lock*));
   MOCK_METHOD0(IsGpuChannelLost, bool());
+  MOCK_METHOD0(SynchronizeCommandBuffer, void());
   MOCK_CONST_METHOD0(GetNamespaceID, CommandBufferNamespace());
   MOCK_CONST_METHOD0(GetCommandBufferID, uint64_t());
   MOCK_CONST_METHOD0(GetExtraCommandBufferData, int32_t());