RTC Video Encoder: Use capturer timestamp

media/gpu/v4l2_video_encode_accelerator.cc

Index: media/gpu/v4l2_video_encode_accelerator.cc
diff --git a/media/gpu/v4l2_video_encode_accelerator.cc b/media/gpu/v4l2_video_encode_accelerator.cc
index 202a502038d3bd514ca2aa5f015c927484c42e1f..a9cb6bac634aa675829c53864f976a5b6c608511 100644
--- a/media/gpu/v4l2_video_encode_accelerator.cc
+++ b/media/gpu/v4l2_video_encode_accelerator.cc
@@ -664,7 +664,8 @@ void V4L2VideoEncodeAccelerator::Dequeue() {
     child_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&Client::BitstreamBufferReady, client_,
-                   output_record.buffer_ref->id, output_size, key_frame));
+                   output_record.buffer_ref->id, output_size, key_frame,
+                   base::TimeDelta::FromMicroseconds(dqbuf.timestamp.tv_usec)));
     output_record.at_device = false;
     output_record.buffer_ref.reset();
     free_output_buffers_.push_back(dqbuf.index);
@@ -689,6 +690,7 @@ bool V4L2VideoEncodeAccelerator::EnqueueInputRecord() {
   qbuf.index = index;
   qbuf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
   qbuf.m.planes = qbuf_planes;
+  qbuf.timestamp.tv_usec = frame->timestamp().InMicroseconds();
 
   DCHECK_EQ(device_input_format_, frame->format());
   for (size_t i = 0; i < input_planes_count_; ++i) {