Move video encode accelerator IPC messages to GPU IO thread

media/gpu/ipc/service/media_gpu_channel.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/gpu/ipc/service/media_gpu_channel.h"
 
 #include "base/unguessable_token.h"
 #include "gpu/ipc/service/gpu_channel.h"
 #include "ipc/message_filter.h"
 #include "media/gpu/ipc/common/media_messages.h"
@@ skipping 148 matching lines @@
     const CreateVideoEncoderParams& params,
     IPC::Message* reply_message) {
   TRACE_EVENT0("gpu", "MediaGpuChannel::OnCreateVideoEncoder");
   gpu::GpuCommandBufferStub* stub =
       channel_->LookupCommandBuffer(command_buffer_route_id);
   if (!stub) {
     reply_message->set_reply_error();
     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);
   GpuCommandBufferMsg_CreateVideoEncoder::WriteReplyParams(reply_message,
                                                            succeeded);
   Send(reply_message);
 
   // encoder is registered as a DestructionObserver of this stub and will
   // self-delete during destruction of this stub.
 }
 
 }  // namespace media