Introduce command buffer control thread

mojo/services/gles2/command_buffer_driver.h

 // Copyright 2013 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 MOJO_SERVICES_GLES2_COMMAND_BUFFER_DRIVER_H_
 #define MOJO_SERVICES_GLES2_COMMAND_BUFFER_DRIVER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "base/timer/timer.h"
 #include "mojo/services/public/interfaces/gpu/command_buffer.mojom.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 
 namespace gpu {
 class CommandBufferService;
 class GpuScheduler;
 class GpuControlService;
 namespace gles2 {
@@ skipping 24 matching lines @@
 
   void Initialize(CommandBufferSyncClientPtr sync_client,
                   ScopedSharedBufferHandle shared_state);
   void SetGetBuffer(int32_t buffer);
   void Flush(int32_t put_offset);
   void MakeProgress(int32_t last_get_offset);
   void RegisterTransferBuffer(int32_t id,
                               ScopedSharedBufferHandle transfer_buffer,
                               uint32_t size);
   void DestroyTransferBuffer(int32_t id);
+  void Echo(const Callback<void()>& callback);
 
-  void SetContextLostCallback(const base::Callback<void(int32_t)>& callback);
+  void SetContextLostCallback(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      const base::Callback<void(int32_t)>& callback);
 
  private:
   bool DoInitialize(ScopedSharedBufferHandle shared_state);
   void OnResize(gfx::Size size, float scale_factor);
   void OnParseError();
   void OnContextLost(uint32_t reason);
 
   CommandBufferSyncClientPtr sync_client_;
 
   gfx::AcceleratedWidget widget_;
   gfx::Size size_;
   scoped_ptr<gpu::CommandBufferService> command_buffer_;
   scoped_ptr<gpu::gles2::GLES2Decoder> decoder_;
   scoped_ptr<gpu::GpuScheduler> scheduler_;
   scoped_refptr<gfx::GLContext> context_;
   scoped_refptr<gfx::GLSurface> surface_;
   scoped_refptr<gfx::GLShareGroup> share_group_;
   scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
+
+  scoped_refptr<base::SingleThreadTaskRunner> context_lost_task_runner_;
   base::Callback<void(int32_t)> context_lost_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferDriver);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_GLES2_COMMAND_BUFFER_DRIVER_H_