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

gpu/command_buffer/tests/gl_manager.cc

Index: gpu/command_buffer/tests/gl_manager.cc
diff --git a/gpu/command_buffer/tests/gl_manager.cc b/gpu/command_buffer/tests/gl_manager.cc
index 95778c9cb47fde802cd155e5cffd2260d664cda7..ce9fd3ccd7f2c5f83b3c34f2109e1b95b960ee33 100644
--- a/gpu/command_buffer/tests/gl_manager.cc
+++ b/gpu/command_buffer/tests/gl_manager.cc
@@ -511,6 +511,10 @@ bool GLManager::GetBufferChanged(int32_t transfer_buffer_id) {
   return executor_->SetGetBuffer(transfer_buffer_id);
 }
 
+void GLManager::SetGpuControlClient(GpuControlClient*) {
+  // The client is not currently called, so don't store it.
+}
+
 Capabilities GLManager::GetCapabilities() {
   return decoder_->GetCapabilities();
 }