Blink handle selection handle visibility

cc/trees/layer_tree_impl.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_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 388 matching lines @@
   LayerImpl* FindFirstScrollingLayerOrScrollbarLayerThatIsHitByPoint(
       const gfx::PointF& screen_space_point);
 
   LayerImpl* FindLayerThatIsHitByPoint(const gfx::PointF& screen_space_point);
 
   LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
       const gfx::PointF& screen_space_point);
 
   void RegisterSelection(const LayerSelection& selection);
 
+  bool GetAndResetHandleVisibilityChanged();
+
   // Compute the current selection handle location and visbility with respect to
   // the viewport.
   void GetViewportSelection(Selection<gfx::SelectionBound>* selection);
 
   void set_top_controls_shrink_blink_size(bool shrink);
   bool top_controls_shrink_blink_size() const {
     return top_controls_shrink_blink_size_;
   }
   bool SetCurrentTopControlsShownRatio(float ratio);
   float CurrentTopControlsShownRatio() const {
@@ skipping 115 matching lines @@
   bool needs_update_draw_properties_;
 
   // In impl-side painting mode, this is true when the tree may contain
   // structural differences relative to the active tree.
   bool needs_full_tree_sync_;
 
   bool next_activation_forces_redraw_;
 
   bool has_ever_been_drawn_;
 
+  bool handle_visibility_changed_;
+
   std::vector<std::unique_ptr<SwapPromise>> swap_promise_list_;
   std::vector<std::unique_ptr<SwapPromise>> pinned_swap_promise_list_;
 
   UIResourceRequestQueue ui_resource_request_queue_;
 
   bool have_scroll_event_handlers_;
   EventListenerProperties event_listener_properties_[static_cast<size_t>(
       EventListenerClass::kNumClasses)];
 
   // Whether or not Blink's viewport size was shrunk by the height of the top
   // controls at the time of the last layout.
   bool top_controls_shrink_blink_size_;
   float top_controls_height_;
   float bottom_controls_height_;
 
   // The amount that the top controls are shown from 0 (hidden) to 1 (fully
   // shown).
   scoped_refptr<SyncedTopControls> top_controls_shown_ratio_;
 
   std::unique_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_