Expose codec implementation names in stats.

webrtc/test/fake_decoder.cc

Index: webrtc/test/fake_decoder.cc
diff --git a/webrtc/test/fake_decoder.cc b/webrtc/test/fake_decoder.cc
index 63316e0dab099d363d4b8675b3feb733c4c0a7af..dbdd580e886edc4ea79fcfb31e3c0a6554dbcf75 100644
--- a/webrtc/test/fake_decoder.cc
+++ b/webrtc/test/fake_decoder.cc
@@ -53,10 +53,16 @@ int32_t FakeDecoder::RegisterDecodeCompleteCallback(
 int32_t FakeDecoder::Release() {
   return WEBRTC_VIDEO_CODEC_OK;
 }
+
 int32_t FakeDecoder::Reset() {
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
+const char* FakeDecoder::kImplementationName = "fake_decoder";
+const char* FakeDecoder::ImplementationName() const {
+  return kImplementationName;
+}
+
 int32_t FakeH264Decoder::Decode(const EncodedImage& input,
                                 bool missing_frames,
                                 const RTPFragmentationHeader* fragmentation,