ObjC: Implement HW codecs in ObjC instead of C++

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodecH264.h

 /*
  *  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 11 matching lines @@
 RTC_EXPORT
 @interface RTCCodecSpecificInfoH264 : NSObject<RTCCodecSpecificInfo>
 
 @property(nonatomic, assign) RTCH264PacketizationMode packetizationMode;
 
 @end
 
 /** Encoder. */
 RTC_EXPORT
 @interface RTCVideoEncoderH264 : NSObject<RTCVideoEncoder>
+
+- (instancetype)initWithCodecInfo:(RTCVideoCodecInfo *)codecInfo;
+
 @end
 
 /** Decoder. */
 RTC_EXPORT
 @interface RTCVideoDecoderH264 : NSObject<RTCVideoDecoder>
 @end
 
 /** Encoder factory. */
 RTC_EXPORT
 @interface RTCVideoEncoderFactoryH264 : NSObject<RTCVideoEncoderFactory>
 @end
 
 /** Decoder factory. */
 RTC_EXPORT
 @interface RTCVideoDecoderFactoryH264 : NSObject<RTCVideoDecoderFactory>
 @end