AddDeletionObserver  130 content/common/gpu/client/command_buffer_proxy_impl.h   void AddDeletionObserver(DeletionObserver* observer);
AddDeletionObserver   37 content/common/gpu/client/gpu_video_decode_accelerator_host.cc   impl_->AddDeletionObserver(this);
AddDeletionObserver   31 content/common/gpu/client/gpu_video_encode_accelerator_host.cc   impl_->AddDeletionObserver(this);