Add encoder/decoder names to software H264.

webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  *
  */
@@ skipping 377 matching lines @@
   av_frame_unref(av_frame_.get());
   video_frame = nullptr;
 
   if (ret) {
     LOG(LS_WARNING) << "DecodedImageCallback::Decoded returned " << ret;
     return ret;
   }
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
+const char* H264DecoderImpl::ImplementationName() const {
+  return "FFmpeg";
+}
+
 bool H264DecoderImpl::IsInitialized() const {
   return av_context_ != nullptr;
 }
 
 void H264DecoderImpl::ReportInit() {
   if (has_reported_init_)
     return;
   RTC_HISTOGRAM_ENUMERATION("WebRTC.Video.H264DecoderImpl.Event",
                             kH264DecoderEventInit,
                             kH264DecoderEventMax);
   has_reported_init_ = true;
 }
 
 void H264DecoderImpl::ReportError() {
   if (has_reported_error_)
     return;
   RTC_HISTOGRAM_ENUMERATION("WebRTC.Video.H264DecoderImpl.Event",
                             kH264DecoderEventError,
                             kH264DecoderEventMax);
   has_reported_error_ = true;
 }
 
 }  // namespace webrtc