Adds support for webrtc::test::ResourcePath on iOS

talk/app/webrtc/objc/RTCDataChannel.mm

 /*
  * libjingle
  * Copyright 2014 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 39 matching lines @@
     RTCDataBuffer* dataBuffer =
         [[RTCDataBuffer alloc] initWithDataBuffer:buffer];
     [_channel.delegate channel:_channel didReceiveMessageWithBuffer:dataBuffer];
   }
 
  private:
   __weak RTCDataChannel* _channel;
 };
 }
 
-// TODO(tkchin): move to shared location
+// TODO(henrika): move to shared location.
+// See https://code.google.com/p/webrtc/issues/detail?id=4773 for details.
 NSString* NSStringFromStdString(const std::string& stdString) {
   // std::string may contain null termination character so we construct
   // using length.
   return [[NSString alloc] initWithBytes:stdString.data()
                                   length:stdString.length()
                                 encoding:NSUTF8StringEncoding];
 }
 
 std::string StdStringFromNSString(NSString* nsString) {
   NSData* charData = [nsString dataUsingEncoding:NSUTF8StringEncoding];
@@ skipping 200 matching lines @@
     _observer.reset(new webrtc::RTCDataChannelObserver(self));
   }
   return self;
 }
 
 - (rtc::scoped_refptr<webrtc::DataChannelInterface>)dataChannel {
   return _dataChannel;
 }
 
 @end