Revert of Remove all reference to carbon api

webrtc/media/devices/carbonvideorenderer.h

+/*
+ *  Copyright (c) 2011 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.
+ */
+
+// Definition of class CarbonVideoRenderer that implements the abstract class
+// cricket::VideoRenderer via Carbon.
+
+#ifndef WEBRTC_MEDIA_DEVICES_CARBONVIDEORENDERER_H_
+#define WEBRTC_MEDIA_DEVICES_CARBONVIDEORENDERER_H_
+
+#include <memory>
+
+#include <Carbon/Carbon.h>
+
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/media/base/videosinkinterface.h"
+
+namespace cricket {
+
+class CarbonVideoRenderer
+    : public rtc::VideoSinkInterface<cricket::VideoFrame> {
+ public:
+  CarbonVideoRenderer(int x, int y);
+  virtual ~CarbonVideoRenderer();
+
+  // Implementation of VideoSinkInterface.
+  void OnFrame(const VideoFrame& frame) override;
+
+  // Needs to be called on the main thread.
+  bool Initialize();
+
+ private:
+  bool SetSize(int width, int height);
+  bool DrawFrame();
+
+  static OSStatus DrawEventHandler(EventHandlerCallRef handler,
+                                   EventRef event,
+                                   void* data);
+  std::unique_ptr<uint8_t[]> image_;
+  rtc::CriticalSection image_crit_;
+  int image_width_;
+  int image_height_;
+  int x_;
+  int y_;
+  WindowRef window_ref_;
+};
+
+}  // namespace cricket
+
+#endif  // WEBRTC_MEDIA_DEVICES_CARBONVIDEORENDERER_H_