Move video encode accelerator IPC messages to GPU IO thread

media/gpu/ipc/service/media_gpu_channel.cc

Index: media/gpu/ipc/service/media_gpu_channel.cc
diff --git a/media/gpu/ipc/service/media_gpu_channel.cc b/media/gpu/ipc/service/media_gpu_channel.cc
index a1aa806728fe8c36c18725360d531896983028e5..6a53bd05b16a2551cc590706b55dc24667091c33 100644
--- a/media/gpu/ipc/service/media_gpu_channel.cc
+++ b/media/gpu/ipc/service/media_gpu_channel.cc
@@ -166,8 +166,8 @@ void MediaGpuChannel::OnCreateVideoEncoder(
     Send(reply_message);
     return;
   }
-  GpuVideoEncodeAccelerator* encoder =
-      new GpuVideoEncodeAccelerator(params.encoder_route_id, stub);
+  GpuVideoEncodeAccelerator* encoder = new GpuVideoEncodeAccelerator(
+      params.encoder_route_id, stub, stub->channel()->io_task_runner());
   bool succeeded =
       encoder->Initialize(params.input_format, params.input_visible_size,
                           params.output_profile, params.initial_bitrate);