RTC Video Encoder: Use capturer timestamp

media/video/video_encode_accelerator.h

Index: media/video/video_encode_accelerator.h
diff --git a/media/video/video_encode_accelerator.h b/media/video/video_encode_accelerator.h
index b147d9140955012b27f9b16c064e1dc61abe84f2..0f07f59b66099a230da9bde1ea840387723e0db5 100644
--- a/media/video/video_encode_accelerator.h
+++ b/media/video/video_encode_accelerator.h
@@ -81,7 +81,8 @@ class MEDIA_EXPORT VideoEncodeAccelerator {
     //  |key_frame| is true if this delivered frame is a keyframe.
     virtual void BitstreamBufferReady(int32_t bitstream_buffer_id,
                                       size_t payload_size,
-                                      bool key_frame) = 0;
+                                      bool key_frame,
+                                      base::TimeDelta timestamp) = 0;
 
     // Error notification callback. Note that errors in Initialize() will not be
     // reported here, but will instead be indicated by a false return value