Hook up ui::Compositor to Display's BeginFrameSource

components/mus/surfaces/direct_output_surface_ozone.h

 // Copyright 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 COMPONENTS_MUS_SURFACES_DIRECT_OUTPUT_SURFACE_OZONE_H_
 #define COMPONENTS_MUS_SURFACES_DIRECT_OUTPUT_SURFACE_OZONE_H_
 
 #include <memory>
 
 #include "base/memory/weak_ptr.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/output_surface.h"
+#include "cc/scheduler/begin_frame_source.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/swap_result.h"
 #include "ui/gl/gl_surface.h"
 
 namespace ui {
 class LatencyInfo;
 }  // namespace ui
 
 namespace cc {
 class CompositorFrame;
 }  // namespace cc
 
 namespace mus {
 
 class BufferQueue;
 class SurfacesContextProvider;
 
 // An OutputSurface implementation that directly draws and swap to a GL
 // "surfaceless" surface (aka one backed by a buffer managed explicitly in
 // mus/ozone. This class is adapted from
 // GpuSurfacelessBrowserCompositorOutputSurface.
 class DirectOutputSurfaceOzone : public cc::OutputSurface {
  public:
   DirectOutputSurfaceOzone(
       const scoped_refptr<SurfacesContextProvider>& context_provider,
       gfx::AcceleratedWidget widget,
+      base::SingleThreadTaskRunner* task_runner,
       uint32_t target,
       uint32_t internalformat);
 
   ~DirectOutputSurfaceOzone() override;
 
   // TODO(rjkroege): Implement the equivalent of Reflector.
 
  private:
   // cc::OutputSurface implementation.
   void SwapBuffers(cc::CompositorFrame* frame) override;
   void BindFramebuffer() override;
   void Reshape(const gfx::Size& size, float scale_factor, bool alpha) override;
   bool IsDisplayedAsOverlayPlane() const override;
   unsigned GetOverlayTextureId() const override;
   bool BindToClient(cc::OutputSurfaceClient* client) override;
 
   // Taken from BrowserCompositor specific API.
   void OnUpdateVSyncParametersFromGpu(base::TimeTicks timebase,
                                       base::TimeDelta interval);
 
   // Called when a swap completion is sent from the GPU process.
   void OnGpuSwapBuffersCompleted(gfx::SwapResult result);
 
   std::unique_ptr<BufferQueue> output_surface_;
+  std::unique_ptr<cc::SyntheticBeginFrameSource> synthetic_begin_frame_source_;
 
   base::WeakPtrFactory<DirectOutputSurfaceOzone> weak_ptr_factory_;
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_SURFACES_DIRECT_OUTPUT_SURFACE_OZONE_H_