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diff --git a/chromium/content/browser/media/capture/web_contents_video_capture_device.h b/chromium/content/browser/media/capture/web_contents_video_capture_device.h
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+// Copyright (c) 2012 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_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_
+#define CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "content/common/content_export.h"
+#include "media/video/capture/video_capture_device.h"
+
+namespace content {
+
+class ContentVideoCaptureDeviceCore;
+
+// A virtualized VideoCaptureDevice that mirrors the displayed contents of a
+// tab (accessed via its associated WebContents instance), producing a stream of
+// video frames.
+//
+// An instance is created by providing a device_id.  The device_id contains the
+// routing ID for a RenderViewHost, and from the RenderViewHost instance, a
+// reference to its associated WebContents instance is acquired.  From then on,
+// WebContentsVideoCaptureDevice will capture from whatever render view is
+// currently associated with that WebContents instance.  This allows the
+// underlying render view to be swapped out (e.g., due to navigation or
+// crashes/reloads), without any interruption in capturing.
+class CONTENT_EXPORT WebContentsVideoCaptureDevice
+    : public media::VideoCaptureDevice {
+ public:
+  // Construct from a |device_id| string of the form:
+  //   "virtual-media-stream://render_process_id:render_view_id", where
+  // |render_process_id| and |render_view_id| are decimal integers.
+  // |destroy_cb| is invoked on an outside thread once all outstanding objects
+  // are completely destroyed -- this will be some time after the
+  // WebContentsVideoCaptureDevice is itself deleted.
+  static media::VideoCaptureDevice* Create(const std::string& device_id);
+
+  virtual ~WebContentsVideoCaptureDevice();
+
+  // VideoCaptureDevice implementation.
+  virtual void AllocateAndStart(const media::VideoCaptureParams& params,
+                                scoped_ptr<Client> client) OVERRIDE;
+  virtual void StopAndDeAllocate() OVERRIDE;
+
+ private:
+  WebContentsVideoCaptureDevice(int render_process_id, int render_view_id);
+
+  const scoped_ptr<ContentVideoCaptureDeviceCore> core_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebContentsVideoCaptureDevice);
+};
+
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_