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 430 matching lines @@
   }
 
   void ResetAllChangeTracking();
 
   void AddToLayerList(LayerImpl* layer);
 
   void ClearLayerList();
 
   void BuildLayerListForTesting();
 
+  bool SelectionChanged();
+
  protected:
   float ClampPageScaleFactorToLimits(float page_scale_factor) const;
   void PushPageScaleFactorAndLimits(const float* page_scale_factor,
                                     float min_page_scale_factor,
                                     float max_page_scale_factor);
   bool SetPageScaleFactorLimits(float min_page_scale_factor,
                                 float max_page_scale_factor);
   bool IsViewportLayerId(int id) const;
   void UpdateScrollbars(int scroll_layer_id, int clip_layer_id);
   void DidUpdatePageScale();
@@ skipping 82 matching lines @@
   // controls at the time of the last layout.
   bool top_controls_shrink_blink_size_;
   float top_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_;
 
+  bool selection_changed_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_