Expose codec implementation names in stats.

webrtc/video_decoder.h

Index: webrtc/video_decoder.h
diff --git a/webrtc/video_decoder.h b/webrtc/video_decoder.h
index 2822677868db4f3aa531e1e7bd4bf3c2dc6ff176..8fa376c5124bdf4fe5c2ee0627540a7085df990a 100644
--- a/webrtc/video_decoder.h
+++ b/webrtc/video_decoder.h
@@ -11,6 +11,7 @@
 #ifndef WEBRTC_VIDEO_DECODER_H_
 #define WEBRTC_VIDEO_DECODER_H_
 
+#include <string>
 #include <vector>
 
 #include "webrtc/common_types.h"
@@ -63,6 +64,7 @@ class VideoDecoder {
 
   virtual int32_t Release() = 0;
   virtual int32_t Reset() = 0;
+  virtual const char* ImplementationName() const { return "unknown"; }
 };
 
 // Class used to wrap external VideoDecoders to provide a fallback option on
@@ -88,6 +90,8 @@ class VideoDecoderSoftwareFallbackWrapper : public webrtc::VideoDecoder {
   int32_t Release() override;
   int32_t Reset() override;
 
+  const char* ImplementationName() const override;
+
  private:
   bool InitFallbackDecoder();
 
@@ -96,6 +100,7 @@ class VideoDecoderSoftwareFallbackWrapper : public webrtc::VideoDecoder {
 
   VideoCodec codec_settings_;
   int32_t number_of_cores_;
+  std::string fallback_implementation_name_;
   rtc::scoped_ptr<VideoDecoder> fallback_decoder_;
   DecodedImageCallback* callback_;
 };