Update API for Objective-C RTCMediaSource.

webrtc/api/BUILD.gn

 # 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.
 
 import("../build/webrtc.gni")
 
@@ skipping 14 matching lines @@
     ]
     cflags = [
       "-fobjc-arc",
       "-Wobjc-missing-property-synthesis",
     ]
     sources = [
       # Add these when there's a BUILD.gn for peer connection APIs
       #"objc/RTCIceCandidate+Private.h",
       #"objc/RTCIceCandidate.h",
       #"objc/RTCIceCandidate.mm",
+      #"objc/RTCMediaSource+Private.h",
+      #"objc/RTCMediaSource.h",
+      #"objc/RTCMediaSource.mm",
       #"objc/RTCMediaStreamTrack+Private.h",
       #"objc/RTCMediaStreamTrack.h",
       #"objc/RTCMediaStreamTrack.mm",
       "objc/RTCIceServer+Private.h",
       "objc/RTCIceServer.h",
       "objc/RTCIceServer.mm",
       "objc/RTCMediaConstraints+Private.h",
       "objc/RTCMediaConstraints.h",
       "objc/RTCMediaConstraints.mm",
       "objc/RTCOpenGLVideoRenderer.h",
@@ skipping 19 matching lines @@
     }
 
     if (is_mac) {
       sources += [
         "objc/RTCNSGLVideoView.h",
         "objc/RTCNSGLVideoView.m",
       ]
     }
   }
 }