ObjC: Split out I420 texture uploading into separate class

webrtc/sdk/BUILD.gn

 # 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.gni")
 if (is_ios) {
@@ skipping 92 matching lines @@
       "objc/Framework/Classes/RTCAudioTrack+Private.h",
       "objc/Framework/Classes/RTCAudioTrack.mm",
       "objc/Framework/Classes/RTCCameraVideoCapturer.m",
       "objc/Framework/Classes/RTCConfiguration+Private.h",
       "objc/Framework/Classes/RTCConfiguration.mm",
       "objc/Framework/Classes/RTCDataChannel+Private.h",
       "objc/Framework/Classes/RTCDataChannel.mm",
       "objc/Framework/Classes/RTCDataChannelConfiguration+Private.h",
       "objc/Framework/Classes/RTCDataChannelConfiguration.mm",
       "objc/Framework/Classes/RTCI420Shader.mm",
+      "objc/Framework/Classes/RTCI420TextureCache.h",
+      "objc/Framework/Classes/RTCI420TextureCache.mm",
       "objc/Framework/Classes/RTCIceCandidate+Private.h",
       "objc/Framework/Classes/RTCIceCandidate.mm",
       "objc/Framework/Classes/RTCIceServer+Private.h",
       "objc/Framework/Classes/RTCIceServer.mm",
       "objc/Framework/Classes/RTCLegacyStatsReport+Private.h",
       "objc/Framework/Classes/RTCLegacyStatsReport.mm",
       "objc/Framework/Classes/RTCMediaConstraints+Private.h",
       "objc/Framework/Classes/RTCMediaConstraints.mm",
       "objc/Framework/Classes/RTCMediaSource+Private.h",
       "objc/Framework/Classes/RTCMediaSource.mm",
@@ skipping 314 matching lines @@
       deps += [ "$rtc_libyuv_dir" ]
       public_deps = [
         "$rtc_libyuv_dir",
       ]
     } else {
       # Need to add a directory normally exported by libyuv.
       include_dirs = [ "$rtc_libyuv_dir/include" ]
     }
   }
 }