Automatically redraw the display on resume.

services/gles2/command_buffer_impl.h

 // Copyright 2014 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 SERVICES_GLES2_COMMAND_BUFFER_IMPL_H_
 #define SERVICES_GLES2_COMMAND_BUFFER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/services/gpu/public/interfaces/command_buffer.mojom.h"
 #include "mojo/services/gpu/public/interfaces/viewport_parameter_listener.mojom.h"
 
 namespace gpu {
 class SyncPointManager;
 }
 
 namespace gles2 {
 class CommandBufferDriver;
 
 // This class listens to the CommandBuffer message pipe on a low-latency thread
 // so that we can insert sync points without blocking on the GL driver. It
 // forwards most method calls to the CommandBufferDriver, which runs on the
 // same thread as the native viewport.
 class CommandBufferImpl : public mojo::CommandBuffer {
  public:
+  class Observer {
+   public:
+    virtual void OnCommandBufferImplDestroyed() = 0;
+  };
+
   CommandBufferImpl(
       mojo::InterfaceRequest<CommandBuffer> request,
       mojo::ViewportParameterListenerPtr listener,
       scoped_refptr<base::SingleThreadTaskRunner> control_task_runner,
       gpu::SyncPointManager* sync_point_manager,
       scoped_ptr<CommandBufferDriver> driver);
   ~CommandBufferImpl() override;
 
   void Initialize(mojo::CommandBufferSyncClientPtr sync_client,
                   mojo::CommandBufferSyncPointClientPtr sync_point_client,
                   mojo::CommandBufferLostContextObserverPtr loss_observer,
                   mojo::ScopedSharedBufferHandle shared_state) override;
   void SetGetBuffer(int32_t buffer) override;
   void Flush(int32_t put_offset) override;
   void MakeProgress(int32_t last_get_offset) override;
   void RegisterTransferBuffer(int32_t id,
                               mojo::ScopedSharedBufferHandle transfer_buffer,
                               uint32_t size) override;
   void DestroyTransferBuffer(int32_t id) override;
   void InsertSyncPoint(bool retire) override;
   void RetireSyncPoint(uint32_t sync_point) override;
   void Echo(const mojo::Callback<void()>& callback) override;
 
   void DidLoseContext();
   void UpdateVSyncParameters(base::TimeTicks timebase,
                              base::TimeDelta interval);
 
+  void set_observer(Observer* observer) { observer_ = observer; }
+
  private:
   void BindToRequest(mojo::InterfaceRequest<CommandBuffer> request);
 
   scoped_refptr<gpu::SyncPointManager> sync_point_manager_;
   scoped_refptr<base::SingleThreadTaskRunner> driver_task_runner_;
   scoped_ptr<CommandBufferDriver> driver_;
   mojo::CommandBufferSyncPointClientPtr sync_point_client_;
   mojo::ViewportParameterListenerPtr viewport_parameter_listener_;
   mojo::StrongBinding<CommandBuffer> binding_;
+  Observer* observer_;
 
   base::WeakPtrFactory<CommandBufferImpl> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(CommandBufferImpl);
 };
 
 }  // namespace gles2
 
 #endif  // SERVICES_GLES2_COMMAND_BUFFER_IMPL_H_