Decouple capture timestamp and reference time

content/browser/renderer_host/media/video_capture_gpu_jpeg_decoder.h

 // Copyright 2015 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_GPU_JPEG_DECODER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_GPU_JPEG_DECODER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 37 matching lines @@
   enum STATUS {
     INIT_PENDING,  // Default value while waiting initialization finished.
     INIT_PASSED,   // Initialization succeed.
     FAILED,        // JPEG decode is not supported, initialization failed, or
                    // decode error.
   };
 
   typedef base::Callback<void(
       std::unique_ptr<media::VideoCaptureDevice::Client::Buffer>,
       const scoped_refptr<media::VideoFrame>&,
-      const base::TimeTicks&)>
+      base::TimeTicks)>
       DecodeDoneCB;
 
   // |decode_done_cb| is called on the IO thread when decode succeed. This can
   // be on any thread. |decode_done_cb| is never called after
   // VideoCaptureGpuJpegDecoder is destroyed.
   explicit VideoCaptureGpuJpegDecoder(const DecodeDoneCB& decode_done_cb);
   ~VideoCaptureGpuJpegDecoder() override;
 
   // Creates and intializes decoder asynchronously.
   void Initialize();
 
   // Returns initialization status.
   STATUS GetStatus() const;
 
   // Decodes a JPEG picture.
   void DecodeCapturedData(
       const uint8_t* data,
       size_t in_buffer_size,
       const media::VideoCaptureFormat& frame_format,
-      const base::TimeTicks& timestamp,
+      base::TimeTicks reference_time,
+      base::TimeDelta timestamp,
       std::unique_ptr<media::VideoCaptureDevice::Client::Buffer> out_buffer);
 
   // JpegDecodeAccelerator::Client implementation.
   // These will be called on IO thread.
   void VideoFrameReady(int32_t buffer_id) override;
   void NotifyError(int32_t buffer_id,
                    media::JpegDecodeAccelerator::Error error) override;
 
  private:
   // Initialization helper, to establish GPU channel.
@@ skipping 39 matching lines @@
   std::unique_ptr<base::SharedMemory> in_shared_memory_;
 
   STATUS decoder_status_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureGpuJpegDecoder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_GPU_JPEG_DECODER_H_