Move classses VideoCaptureDeviceClient and VideoCaptureBufferPool to media/capture/video

media/capture/video/video_frame_receiver.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/capture/capture_export.h"
+#include "media/capture/video/video_capture_device.h"
+
+namespace media {
+
+// Callback interface for VideoCaptureDeviceClient to communicate with its
+// clients.
+class CAPTURE_EXPORT VideoFrameReceiver {
+ public:
+  virtual ~VideoFrameReceiver(){};
+
+  virtual void OnIncomingCapturedVideoFrame(
+      std::unique_ptr<media::VideoCaptureDevice::Client::Buffer> buffer,
+      const scoped_refptr<media::VideoFrame>& frame) = 0;
+  virtual void OnError() = 0;
+  virtual void OnLog(const std::string& message) = 0;
+  virtual void OnBufferDestroyed(int buffer_id_to_drop) = 0;
+};
+
+}  // namespace media