Extract nested and private classes from VideoCaptureBufferPool

content/browser/renderer_host/media/video_capture_buffer_tracker_factory.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.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_BUFFER_TRACKER_FACTORY_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_BUFFER_TRACKER_FACTORY_H_
+
+#include <memory>
+
+#include "content/browser/renderer_host/media/video_capture_buffer_tracker.h"
+
+namespace content {
+
+class VideoCaptureBufferTrackerFactory {
+ public:
+  static std::unique_ptr<VideoCaptureBufferTracker> CreateTracker(
+      media::VideoPixelStorage storage);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_BUFFER_TRACKER_FACTORY_H_