Make lost context and error message callbacks on GpuControl go to client

gpu/command_buffer/client/gpu_control_client.h

Index: gpu/command_buffer/client/gpu_control_client.h
diff --git a/gpu/command_buffer/client/gpu_control_client.h b/gpu/command_buffer/client/gpu_control_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..aaee9b197ee9a47e5df0c314192963a621b07fb9
--- /dev/null
+++ b/gpu/command_buffer/client/gpu_control_client.h
@@ -0,0 +1,20 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_CLIENT_H_
+#define GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_CLIENT_H_
+
+#include <cstdint>
+
+namespace gpu {
+
+class GpuControlClient {
+ public:
+  virtual void OnGpuControlLostContext() = 0;
+  virtual void OnGpuControlErrorMessage(const char* message, int32_t id) = 0;
+};
+
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_CLIENT_H_