MediaLog: Log selected audio/video decoder name.

media/filters/gpu_video_decoder.h

Index: media/filters/gpu_video_decoder.h
diff --git a/media/filters/gpu_video_decoder.h b/media/filters/gpu_video_decoder.h
index 33076840fa922e892281b6d7858f5bb475485673..743c1278c6aba4e964e8b859e64eebd7338d8246 100644
--- a/media/filters/gpu_video_decoder.h
+++ b/media/filters/gpu_video_decoder.h
@@ -38,10 +38,10 @@ class MEDIA_EXPORT GpuVideoDecoder
       public VideoDecodeAccelerator::Client {
  public:
   explicit GpuVideoDecoder(
-      const scoped_refptr<GpuVideoAcceleratorFactories>& factories,
-      const scoped_refptr<MediaLog>& media_log);
+      const scoped_refptr<GpuVideoAcceleratorFactories>& factories);
 
   // VideoDecoder implementation.
+  virtual std::string GetDisplayName() const OVERRIDE;
   virtual void Initialize(const VideoDecoderConfig& config,
                           bool low_delay,
                           const PipelineStatusCB& status_cb,
@@ -152,8 +152,6 @@ class MEDIA_EXPORT GpuVideoDecoder
   // steady-state of the decoder.
   std::vector<SHMBuffer*> available_shm_segments_;
 
-  scoped_refptr<MediaLog> media_log_;
-
   std::map<int32, PendingDecoderBuffer> bitstream_buffers_in_decoder_;
   PictureBufferMap assigned_picture_buffers_;
   // PictureBuffers given to us by VDA via PictureReady, which we sent forward