gpu: Add flag for enabling asynchronous worker context.

gpu/ipc/client/gpu_channel_host.h

 // 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.
 
 #ifndef GPU_IPC_CLIENT_GPU_CHANNEL_HOST_H_
 #define GPU_IPC_CLIENT_GPU_CHANNEL_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 60 matching lines @@
  public:
   // Must be called on the main thread (as defined by the factory).
   static scoped_refptr<GpuChannelHost> Create(
       GpuChannelHostFactory* factory,
       int channel_id,
       const gpu::GPUInfo& gpu_info,
       const IPC::ChannelHandle& channel_handle,
       base::WaitableEvent* shutdown_event,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager);
 
-  static const int32_t kDefaultStreamId = gpu::GPU_STREAM_DEFAULT;
-  static const gpu::GpuStreamPriority kDefaultStreamPriority =
-      gpu::GpuStreamPriority::NORMAL;
-
   bool IsLost() const {
     DCHECK(channel_filter_.get());
     return channel_filter_->IsLost();
   }
 
   int channel_id() const { return channel_id_; }
 
   // The GPU stats reported by the GPU process.
   const gpu::GPUInfo& gpu_info() const { return gpu_info_; }
 
@@ skipping 197 matching lines @@
   mutable base::Lock context_lock_;
   std::unique_ptr<IPC::SyncChannel> channel_;
   base::hash_map<int32_t, StreamFlushInfo> stream_flush_info_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_CLIENT_GPU_CHANNEL_HOST_H_