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

gpu/command_buffer/client/gpu_control.h

Index: gpu/command_buffer/client/gpu_control.h
diff --git a/gpu/command_buffer/client/gpu_control.h b/gpu/command_buffer/client/gpu_control.h
index 12ad377b5535cb0cb632e8f766e7900430b16b27..7baf62c2e2229a6023193dc251f3ef87b74fb347 100644
--- a/gpu/command_buffer/client/gpu_control.h
+++ b/gpu/command_buffer/client/gpu_control.h
@@ -29,6 +29,7 @@ class GpuMemoryBuffer;
 }
 
 namespace gpu {
+class GpuControlClient;
 struct SyncToken;
 
 // Common interface for GpuControl implementations.
@@ -37,6 +38,8 @@ class GPU_EXPORT GpuControl {
   GpuControl() {}
   virtual ~GpuControl() {}
 
+  virtual void SetGpuControlClient(GpuControlClient* gpu_control_client) = 0;
+
   virtual Capabilities GetCapabilities() = 0;
 
   // Create an image for a client buffer with the given dimensions and