Hook up ui::Compositor to Display's BeginFrameSource

cc/test/fake_layer_tree_host_impl_client.h

 // Copyright 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 CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_CLIENT_H_
 #define CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_CLIENT_H_
 
 #include "cc/debug/frame_timing_tracker.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/trees/layer_tree_host_impl.h"
 
 namespace cc {
 
 class FakeLayerTreeHostImplClient : public LayerTreeHostImplClient {
  public:
   // LayerTreeHostImplClient implementation.
   void UpdateRendererCapabilitiesOnImplThread() override {}
   void DidLoseOutputSurfaceOnImplThread() override {}
   void CommitVSyncParameters(base::TimeTicks timebase,
                              base::TimeDelta interval) override {}
+  void SetBeginFrameSource(BeginFrameSource* source) override {}
   void SetEstimatedParentDrawTime(base::TimeDelta draw_time) override {}
   void DidSwapBuffersOnImplThread() override {}
   void DidSwapBuffersCompleteOnImplThread() override {}
   void OnCanDrawStateChanged(bool can_draw) override {}
   void NotifyReadyToActivate() override {}
   void NotifyReadyToDraw() override {}
   void SetNeedsRedrawOnImplThread() override {}
   void SetNeedsRedrawRectOnImplThread(const gfx::Rect& damage_rect) override {}
   void SetNeedsOneBeginImplFrameOnImplThread() override {}
   void SetNeedsCommitOnImplThread() override {}
@@ skipping 12 matching lines @@
   void OnDrawForOutputSurface(bool resourceless_software_draw) override {}
   void PostFrameTimingEventsOnImplThread(
       std::unique_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
       std::unique_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events)
       override {}
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_CLIENT_H_