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 3d0410429fb21af8911e516bdecc3888a871f2de..46a038ff2ea613b07b41edd4b1373fa4cf4aaaa5 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"
@@ -73,6 +74,7 @@ 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
@@ -98,6 +100,8 @@ class VideoDecoderSoftwareFallbackWrapper : public webrtc::VideoDecoder {
   int32_t Release() override;
   int32_t Reset() override;
 
+  const char* ImplementationName() const override;
+
  private:
   bool InitFallbackDecoder();
 
@@ -106,6 +110,7 @@ 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_;
 };