Allow compositor locks to extend timeout.

ui/compositor/compositor.h

 // Copyright (c) 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 UI_COMPOSITOR_COMPOSITOR_H_
 #define UI_COMPOSITOR_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 347 matching lines @@
   const cc::RendererSettings& GetRendererSettings() const;
 
   LayerAnimatorCollection* layer_animator_collection() {
     return &layer_animator_collection_;
   }
 
   const cc::FrameSinkId& frame_sink_id() const { return frame_sink_id_; }
   int activated_frame_count() const { return activated_frame_count_; }
   float refresh_rate() const { return refresh_rate_; }
 
+  void set_allow_locks_to_extend_timeout(bool allowed) {
+    allow_locks_to_extend_timeout_ = allowed;
+  }
+
  private:
   friend class base::RefCounted<Compositor>;
 
   // CompositorLockDelegate implementation.
   void RemoveCompositorLock(CompositorLock* lock) override;
 
   // Causes all active CompositorLocks to be timed out.
   void TimeoutLocks();
 
   gfx::Size size_;
@@ skipping 33 matching lines @@
 
   std::vector<CompositorLock*> active_locks_;
 
   LayerAnimatorCollection layer_animator_collection_;
   scoped_refptr<cc::AnimationTimeline> animation_timeline_;
   std::unique_ptr<ScopedAnimationDurationScaleMode> slow_animations_;
 
   gfx::ColorSpace output_color_space_;
   gfx::ColorSpace blending_color_space_;
 
+  // The estimated time that the locks will be timedout.

[danakj, 2017/05/09 15:49:47]

will time out.

+  base::TimeTicks scheduled_timeout_;
+  // If true, the |scheduled_timeout_| might be recalculated and extended.
+  bool allow_locks_to_extend_timeout_;
+
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
   base::WeakPtrFactory<Compositor> lock_timeout_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_