Expose codec implementation names in stats.

talk/app/webrtc/java/jni/androidmediadecoder_jni.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 74 matching lines @@
 
   int32_t RegisterDecodeCompleteCallback(DecodedImageCallback* callback)
       override;
 
   int32_t Release() override;
 
   int32_t Reset() override;
   // rtc::MessageHandler implementation.
   void OnMessage(rtc::Message* msg) override;
 
+  const char* ImplementationName() const override;
+
  private:
   // CHECK-fail if not running on |codec_thread_|.
   void CheckOnCodecThread();
 
   int32_t InitDecodeOnCodecThread();
   int32_t ReleaseOnCodecThread();
   int32_t DecodeOnCodecThread(const EncodedImage& inputImage);
   // Deliver any outputs pending in the MediaCodec to our |callback_| and return
   // true on success.
   bool DeliverPendingOutputs(JNIEnv* jni, int dequeue_timeout_us);
@@ skipping 782 matching lines @@
   ALOGW << "Can not find HW video decoder for type " << (int)type;
   return NULL;
 }
 
 void MediaCodecVideoDecoderFactory::DestroyVideoDecoder(
     webrtc::VideoDecoder* decoder) {
   ALOGD << "Destroy video decoder.";
   delete decoder;
 }
 
+const char* MediaCodecVideoDecoder::ImplementationName() const {
+  return "MediaCodec";
+}
+
 }  // namespace webrtc_jni