Update/move RTCVideoRendererAdapter to webrtc/api/objc.

webrtc/api/api.gyp

 # Copyright (c) 2015 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.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 28 matching lines @@
             'objc/RTCSessionDescription+Private.h',
             'objc/RTCSessionDescription.h',
             'objc/RTCSessionDescription.mm',
             'objc/RTCStatsReport+Private.h',
             'objc/RTCStatsReport.h',
             'objc/RTCStatsReport.mm',
             'objc/RTCVideoFrame+Private.h',
             'objc/RTCVideoFrame.h',
             'objc/RTCVideoFrame.mm',
             'objc/RTCVideoRenderer.h',
+            'objc/RTCVideoRendererAdapter+Private.h',
+            'objc/RTCVideoRendererAdapter.h',
+            'objc/RTCVideoRendererAdapter.mm',
             'objc/RTCVideoSource+Private.h',
             'objc/RTCVideoSource.h',
             'objc/RTCVideoSource.mm',
           ],
           'conditions': [
             ['OS=="ios"', {
               'sources': [
                 'objc/RTCEAGLVideoView.h',
                 'objc/RTCEAGLVideoView.m',
               ],
@@ skipping 18 matching lines @@
           'xcode_settings': {
             'CLANG_ENABLE_OBJC_ARC': 'YES',
             'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'YES',
             'GCC_PREFIX_HEADER': 'objc/WebRTC-Prefix.pch',
           },
         }
       ],
     }], # OS=="ios"
   ],
 }