Changed GpuVSyncProvider to implement gfx::VSyncProvider

gpu/ipc/service/gpu_vsync_provider_win.h

+// Copyright (c) 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.
+
+#ifndef GPU_IPC_SERVICE_GPU_VSYNC_PROVIDER_WIN_H_
+#define GPU_IPC_SERVICE_GPU_VSYNC_PROVIDER_WIN_H_
+
+#include <memory>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/synchronization/lock.h"
+#include "base/time/time.h"
+#include "gpu/gpu_export.h"
+#include "gpu/ipc/common/surface_handle.h"
+#include "gpu/ipc/service/image_transport_surface_delegate.h"
+#include "ui/gfx/vsync_provider.h"
+
+namespace gpu {
+
+class GpuVSyncWorker;
+class GpuVSyncMessageFilter;
+
+class GPU_EXPORT GpuVSyncProviderWin : public gfx::VSyncProvider {
+ public:
+  GpuVSyncProviderWin(base::WeakPtr<ImageTransportSurfaceDelegate> delegate,
+                      SurfaceHandle surface_handle);
+  ~GpuVSyncProviderWin() override;
+
+  // This class ignores this method and updates VSync directly via a
+  // worker thread IPC call.
+  void GetVSyncParameters(const UpdateVSyncCallback& callback) override;
+
+ private:
+  void OnVSync(base::TimeTicks timestamp, base::TimeDelta interval);
+
+  // VSync worker that waits for VSync events on worker thread.
+  scoped_refptr<GpuVSyncWorker> vsync_worker_;
+  // Message filter to send/receive IPC messages.
+  scoped_refptr<GpuVSyncMessageFilter> message_filter_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuVSyncProviderWin);
+};
+
+}  // namespace gpu
+
+#endif  // GPU_IPC_SERVICE_GPU_VSYNC_PROVIDER_WIN_H_