Blink handle selection handle visibility

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 1a1a9cfebe168d676730b0c8a702ee03cd0f8cba..24e4f8aff879c80c6f1c748b83c73318cb22aa56 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -402,6 +402,8 @@ class CC_EXPORT LayerTreeImpl {
 
   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);
@@ -537,6 +539,8 @@ class CC_EXPORT LayerTreeImpl {
 
   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_;