Hide fullscreen rotation jank

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 ccff3c2447bfcb393ab6ae4e38a813d4c3dec2b4..cc2d8413136e623a5e3e82cb22124c8657a1b31d 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -252,6 +252,9 @@ class CC_EXPORT LayerTreeImpl {
     has_transparent_background_ = transparent;
   }
 
+  bool is_fullscreen() const { return is_fullscreen_; }
+  void set_is_fullscreen(bool is_fullscreen) { is_fullscreen_ = is_fullscreen; }
+
   void UpdatePropertyTreeScrollingAndAnimationFromMainThread(
       bool is_impl_side_update);
   void SetPageScaleOnActiveTree(float active_page_scale);
@@ -538,6 +541,7 @@ class CC_EXPORT LayerTreeImpl {
   PropertyTrees property_trees_;
   SkColor background_color_;
   bool has_transparent_background_;
+  bool is_fullscreen_;
 
   int last_scrolled_scroll_node_index_;