Split iOS sdk in to separate targets

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

 /*
  *  Copyright 2016 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.
  */
 
 #import "WebRTC/RTCTracing.h"
 
 #include "webrtc/base/event_tracer.h"
 
 void RTCSetupInternalTracer() {
   rtc::tracing::SetupInternalTracer();
 }
 
 BOOL RTCStartInternalCapture(NSString *filePath) {
   return rtc::tracing::StartInternalCapture(filePath.UTF8String);
 }
 
 void RTCStopInternalCapture() {
   rtc::tracing::StopInternalCapture();
 }
 
 void RTCShutdownInternalTracer() {
   rtc::tracing::ShutdownInternalTracer();
 }