RTC Video Encoder: Use capturer timestamp

media/gpu/ipc/service/gpu_video_encode_accelerator.cc

Index: media/gpu/ipc/service/gpu_video_encode_accelerator.cc
diff --git a/media/gpu/ipc/service/gpu_video_encode_accelerator.cc b/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
index 3287d7b6832188bfb47eeedf776f872de628259d..fb728deb52050d66fc5e125a4744eb65f32ce3f1 100644
--- a/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
+++ b/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
@@ -152,9 +152,10 @@ void GpuVideoEncodeAccelerator::RequireBitstreamBuffers(
 void GpuVideoEncodeAccelerator::BitstreamBufferReady(
     int32_t bitstream_buffer_id,
     size_t payload_size,
-    bool key_frame) {
+    bool key_frame,
+    base::TimeDelta timestamp) {
   Send(new AcceleratedVideoEncoderHostMsg_BitstreamBufferReady(
-      host_route_id_, bitstream_buffer_id, payload_size, key_frame));
+      host_route_id_, bitstream_buffer_id, payload_size, key_frame, timestamp));
 }
 
 void GpuVideoEncodeAccelerator::NotifyError(