Implement CVO for iOS capturer

webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.h

 /*
  *  Copyright 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.
  */
 
@@ skipping 38 matching lines @@
   // Returns whether the rear-facing camera can be used.
   // e.g. It can't be used because it doesn't exist.
   bool CanUseBackCamera() const;
 
   // Switches the camera being used (either front or back).
   void SetUseBackCamera(bool useBackCamera);
   bool GetUseBackCamera() const;
 
   // Converts the sample buffer into a cricket::CapturedFrame and signals the
   // frame for capture.
-  void CaptureSampleBuffer(CMSampleBufferRef sampleBuffer);
+  void CaptureSampleBuffer(CMSampleBufferRef sample_buffer,
+                           webrtc::VideoRotation rotation);
 
   // Handles messages from posts.
   void OnMessage(rtc::Message *msg) override;
 
  private:
-  void OnFrameMessage(CVImageBufferRef image_buffer, int64_t capture_time_ns);
+  void OnFrameMessage(CVImageBufferRef image_buffer,
+                      webrtc::VideoRotation rotation,
+                      int64_t capture_time_ns);
 
   RTCAVFoundationVideoCapturerInternal *_capturer;
   rtc::Thread *_startThread;  // Set in Start(), unset in Stop().
   webrtc::I420BufferPool _buffer_pool;
 };  // AVFoundationVideoCapturer
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_OBJC_AVFOUNDATION_VIDEO_CAPTURER_H_