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 30e27792e978c4822c09f2d45f5f338e3ffd7a67..3cd94e8270dfb906870e8428455a02bff9fba979 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"
@@ -78,6 +79,8 @@ class VideoDecoder {
   // That is, it can not decode infinite number of frames before the decoded
   // frame is consumed.
   virtual bool PrefersLateDecoding() const { return true; }
+
+  virtual const char* ImplementationName() const { return "unknown"; }
 };
 
 // Class used to wrap external VideoDecoders to provide a fallback option on
@@ -104,6 +107,8 @@ class VideoDecoderSoftwareFallbackWrapper : public webrtc::VideoDecoder {
   int32_t Reset() override;
   bool PrefersLateDecoding() const override;
 
+  const char* ImplementationName() const override;
+
  private:
   bool InitFallbackDecoder();
 
@@ -112,6 +117,7 @@ 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_;
 };