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 62a8539b79297e32f6d96a032a090ce254dec65a..ff29fed2aba7f9f5a8b8eba38e50ff71dd5f6b61 100644
--- a/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
+++ b/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
@@ -151,9 +151,10 @@ 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(