vr/gpu: BrowserGpuChannelHostFactory should be called on the same thread.

content/browser/gpu/browser_gpu_channel_host_factory.cc

 // Copyright (c) 2012 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 "content/browser/gpu/browser_gpu_channel_host_factory.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/profiler/scoped_tracker.h"
@@ skipping 238 matching lines @@
 BrowserGpuChannelHostFactory::AllocateSharedMemory(size_t size) {
   std::unique_ptr<base::SharedMemory> shm(new base::SharedMemory());
   if (!shm->CreateAnonymous(size))
     return std::unique_ptr<base::SharedMemory>();
   return shm;
 }
 
 void BrowserGpuChannelHostFactory::EstablishGpuChannel(
     const gpu::GpuChannelEstablishedCallback& callback) {
   DCHECK(!service_manager::ServiceManagerIsRemote());
+  DCHECK(IsMainThread());
   if (gpu_channel_.get() && gpu_channel_->IsLost()) {
     DCHECK(!pending_request_.get());
     // Recreate the channel if it has been lost.
     gpu_channel_->DestroyChannel();
     gpu_channel_ = NULL;
   }
 
   if (!gpu_channel_.get() && !pending_request_.get()) {
     // We should only get here if the context was lost.
     pending_request_ =
@@ skipping 69 matching lines @@
 }
 
 // static
 void BrowserGpuChannelHostFactory::InitializeShaderDiskCacheOnIO(
     int gpu_client_id,
     const base::FilePath& cache_dir) {
   GetShaderCacheFactorySingleton()->SetCacheInfo(gpu_client_id, cache_dir);
 }
 
 }  // namespace content