ObjC: Add implementationName for injectable codecs

webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoCodecH264.mm

 /*
  *  Copyright 2017 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 163 matching lines @@
 
 - (BOOL)setBitrate:(uint32_t)bitrateKbit framerate:(uint32_t)framerate {
   return _videoToolboxEncoder->SetRates(bitrateKbit, framerate) == WEBRTC_VIDEO_CODEC_OK;
 }
 
 - (RTCVideoEncoderQpThresholds *)scalingSettings {
   return [[RTCVideoEncoderQpThresholds alloc] initWithThresholdsLow:kLowH264QpThreshold
                                                                high:kHighH264QpThreshold];
 }
 
+- (NSString *)implementationName {
+  return @"VideoToolbox";
+}
+
 @end
 
 // Decoder.
 @implementation RTCVideoDecoderH264 {
   webrtc::H264VideoToolboxDecoder *_videoToolboxDecoder;
   H264VideoToolboxDecodeCompleteCallback *_toolboxCallback;
 }
 
 - (instancetype)init {
   if (self = [super init]) {
@@ skipping 46 matching lines @@
     codecSpecificInfo = [(RTCCodecSpecificInfoH264 *)info nativeCodecSpecificInfo];
   }
 
   std::unique_ptr<webrtc::RTPFragmentationHeader> header =
       [fragmentationHeader createNativeFragmentationHeader];
 
   return _videoToolboxDecoder->Decode(
       image, missingFrames, header.release(), &codecSpecificInfo, renderTimeMs);
 }
 
+- (NSString *)implementationName {
+  return @"VideoToolbox";
+}
+
 @end
 
 // Encoder factory.
 @implementation RTCVideoEncoderFactoryH264
 
 - (NSArray<RTCVideoCodecInfo *> *)supportedCodecs {
   NSMutableArray<RTCVideoCodecInfo *> *codecs = [NSMutableArray array];
   NSString *codecName = [NSString stringWithUTF8String:cricket::kH264CodecName];
 
   if (IsHighProfileEnabled()) {
@@ skipping 35 matching lines @@
 - (id<RTCVideoDecoder>)createDecoder:(RTCVideoCodecInfo *)info {
   return [[RTCVideoDecoderH264 alloc] init];
 }
 
 - (NSArray<RTCVideoCodecInfo *> *)supportedCodecs {
   NSString *codecName = [NSString stringWithUTF8String:cricket::kH264CodecName];
   return @[ [[RTCVideoCodecInfo alloc] initWithPayload:0 name:codecName parameters:@{}] ];
 }
 
 @end