Add metadata to media::VideoFrame and plumb it through IPC/MediaStream.

content/browser/media/capture/content_video_capture_device_core.h

 // Copyright 2014 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_CONTENT_VIDEO_CAPTURE_DEVICE_CORE_H_
 #define CONTENT_BROWSER_MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_DEVICE_CORE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 65 matching lines @@
   void ReportError(const std::string& reason);
 
  private:
   friend class base::RefCountedThreadSafe<ThreadSafeCaptureOracle>;
   virtual ~ThreadSafeCaptureOracle();
 
   // Callback invoked on completion of all captures.
   void DidCaptureFrame(
       int frame_number,
       const scoped_refptr<media::VideoCaptureDevice::Client::Buffer>& buffer,
+      base::TimeTicks capture_begin_time,
       const scoped_refptr<media::VideoFrame>& frame,
       base::TimeTicks timestamp,
       bool success);
 
   // Protects everything below it.
   mutable base::Lock lock_;
 
   // Recipient of our capture activity.
   scoped_ptr<media::VideoCaptureDevice::Client> client_;
 
@@ skipping 85 matching lines @@
   // component of the system with direct access to |client_|.
   scoped_refptr<ThreadSafeCaptureOracle> oracle_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentVideoCaptureDeviceCore);
 };
 
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_DEVICE_CORE_H_