Add ImplementationName to SimulcastEncoderAdapter.

webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc

 /*
  *  Copyright (c) 2014 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 478 matching lines @@
 
 bool SimulcastEncoderAdapter::SupportsNativeHandle() const {
   // We should not be calling this method before streaminfos_ are configured.
   RTC_DCHECK(!streaminfos_.empty());
   // TODO(pbos): Support textures when using more than one encoder.
   if (streaminfos_.size() != 1)
     return false;
   return streaminfos_[0].encoder->SupportsNativeHandle();
 }
 
+const char* SimulcastEncoderAdapter::ImplementationName() const {
+  // We should not be calling this method before streaminfos_ are configured.
+  RTC_DCHECK(!streaminfos_.empty());
+  // TODO(pbos): Support multiple implementation names for different encoders.
+  return streaminfos_[0].encoder->ImplementationName();
+}
+
 }  // namespace webrtc