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

webrtc/sdk/BUILD.gn

Index: webrtc/sdk/BUILD.gn
diff --git a/webrtc/sdk/BUILD.gn b/webrtc/sdk/BUILD.gn
index e691a8e5bb41a1ad4780a40f18e3992a67a8b19a..5711fcb2b778dcb303578cb09c3043fb71c99154 100644
--- a/webrtc/sdk/BUILD.gn
+++ b/webrtc/sdk/BUILD.gn
@@ -148,6 +148,8 @@ if (is_ios || is_mac) {
         "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",
@@ -258,7 +260,7 @@ if (is_ios || is_mac) {
       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) {