gpu: Add SequenceId for identifying sync point sequences.

media/gpu/ipc/service/gpu_video_decode_accelerator.cc

Index: media/gpu/ipc/service/gpu_video_decode_accelerator.cc
diff --git a/media/gpu/ipc/service/gpu_video_decode_accelerator.cc b/media/gpu/ipc/service/gpu_video_decode_accelerator.cc
index cb61aceda8af7b7430fbaf07f2441b1bfddbdd12..ab4fcd316dce3232b708f7ed0d0f0bd666418460 100644
--- a/media/gpu/ipc/service/gpu_video_decode_accelerator.cc
+++ b/media/gpu/ipc/service/gpu_video_decode_accelerator.cc
@@ -343,7 +343,7 @@ bool GpuVideoDecodeAccelerator::Initialize(
     const VideoDecodeAccelerator::Config& config) {
   DCHECK(!video_decode_accelerator_);
 
-  if (!stub_->channel()->AddRoute(host_route_id_, stub_->stream_id(), this)) {
+  if (!stub_->channel()->AddRoute(host_route_id_, stub_->sequence_id(), this)) {
     DLOG(ERROR) << "Initialize(): failed to add route";
     return false;
   }