Add encoder/decoder names to software H264.

webrtc/modules/video_coding/codecs/h264/h264_encoder_impl.h

 /*
  *  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 34 matching lines @@
   int32_t RegisterEncodeCompleteCallback(
       EncodedImageCallback* callback) override;
   int32_t SetRates(uint32_t bitrate, uint32_t framerate) override;
 
   // The result of encoding - an EncodedImage and RTPFragmentationHeader - are
   // passed to the encode complete callback.
   int32_t Encode(const VideoFrame& frame,
                  const CodecSpecificInfo* codec_specific_info,
                  const std::vector<FrameType>* frame_types) override;
 
+  const char* ImplementationName() const override;
+
   // Unsupported / Do nothing.
   int32_t SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
   int32_t SetPeriodicKeyFrames(bool enable) override;
   void OnDroppedFrame() override;
 
  private:
   bool IsInitialized() const;
   SEncParamExt CreateEncoderParams() const;
 
   webrtc::H264BitstreamParser h264_bitstream_parser_;
@@ skipping 10 matching lines @@
   std::unique_ptr<uint8_t[]> encoded_image_buffer_;
   EncodedImageCallback* encoded_image_callback_;
 
   bool has_reported_init_;
   bool has_reported_error_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_ENCODER_IMPL_H_