[iOS] Fix incorrectly oriented frames when rapidly switching between cameras.

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 130 matching lines @@
     }
 
     rtc_static_library("objc_video") {
       sources = [
         "objc/Framework/Classes/Video/RTCAVFoundationVideoCapturerInternal.h",
         "objc/Framework/Classes/Video/RTCAVFoundationVideoCapturerInternal.mm",
         "objc/Framework/Classes/Video/RTCDefaultShader.h",
         "objc/Framework/Classes/Video/RTCDefaultShader.mm",
         "objc/Framework/Classes/Video/RTCI420TextureCache.h",
         "objc/Framework/Classes/Video/RTCI420TextureCache.mm",
+        "objc/Framework/Classes/Video/RTCImageHelper.h",
+        "objc/Framework/Classes/Video/RTCImageHelper.mm",
         "objc/Framework/Classes/Video/RTCOpenGLDefines.h",
         "objc/Framework/Classes/Video/RTCShader.h",
         "objc/Framework/Classes/Video/RTCShader.mm",
         "objc/Framework/Classes/Video/avfoundationformatmapper.h",
         "objc/Framework/Classes/Video/avfoundationformatmapper.mm",
         "objc/Framework/Classes/Video/avfoundationvideocapturer.h",
         "objc/Framework/Classes/Video/avfoundationvideocapturer.mm",
       ]
       libs = []
       if (is_ios) {
@@ skipping 90 matching lines @@
         ]
         configs += [ "..:common_objc" ]
         public_configs = [ ":objc_common_config" ]
       }
     }
 
     rtc_static_library("objc_peerconnection") {
       sources = [
         "objc/Framework/Classes/PeerConnection/RTCAVFoundationVideoSource+Private.h",
         "objc/Framework/Classes/PeerConnection/RTCAVFoundationVideoSource.mm",
-        "objc/Framework/Classes/PeerConnection/RTCCameraVideoCapturer.m",
+        "objc/Framework/Classes/PeerConnection/RTCCameraVideoCapturer.mm",
         "objc/Framework/Headers/WebRTC/RTCCameraVideoCapturer.h",
       ]
       if (is_ios) {
         sources += [
           "objc/Framework/Classes/PeerConnection/RTCFileVideoCapturer.h",
           "objc/Framework/Classes/PeerConnection/RTCFileVideoCapturer.m",
         ]
       }
       libs = [ "AVFoundation.framework" ]
 
@@ skipping 448 matching lines @@
         public_deps = [
           "$rtc_libyuv_dir",
         ]
       } else {
         # Need to add a directory normally exported by libyuv.
         include_dirs = [ "$rtc_libyuv_dir/include" ]
       }
     }
   }
 }