Decouple capture timestamp and reference time

content/renderer/media/video_capture_message_filter.h

Index: content/renderer/media/video_capture_message_filter.h
diff --git a/content/renderer/media/video_capture_message_filter.h b/content/renderer/media/video_capture_message_filter.h
index 9088cd38f24a1a6f6d512d6b4f43c37930e7fcdb..059397159573f0d9ecc7c13bb992e9bd094478fc 100644
--- a/content/renderer/media/video_capture_message_filter.h
+++ b/content/renderer/media/video_capture_message_filter.h
@@ -48,14 +48,13 @@ class CONTENT_EXPORT VideoCaptureMessageFilter : public IPC::MessageFilter {
 
     // Called when a buffer referencing a captured VideoFrame is received from
     // Browser process.
-    virtual void OnBufferReceived(
-        int buffer_id,
-        base::TimeTicks timestamp,
-        const base::DictionaryValue& metadata,
-        media::VideoPixelFormat pixel_format,
-        media::VideoFrame::StorageType storage_type,
-        const gfx::Size& coded_size,
-        const gfx::Rect& visible_rect) = 0;
+    virtual void OnBufferReceived(int buffer_id,
+                                  base::TimeDelta timestamp,
+                                  const base::DictionaryValue& metadata,
+                                  media::VideoPixelFormat pixel_format,
+                                  media::VideoFrame::StorageType storage_type,
+                                  const gfx::Size& coded_size,
+                                  const gfx::Rect& visible_rect) = 0;
 
     // Called when state of a video capture device has changed in the browser
     // process.