Hide fullscreen rotation jank

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index dab33a85246b48d96f8dcfa7ec74c73373d126f7..0661fcbed888d2164735e2763a642a0b12fc1a82 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -308,6 +308,9 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
     return has_transparent_background_;
   }
 
+  void set_is_fullscreen(bool is_fullscreen) { is_fullscreen_ = is_fullscreen; }
+  bool is_fullscreen() const { return is_fullscreen_; }
+
   void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
                                bool use_anchor,
                                float scale,
@@ -606,6 +609,8 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
   SkColor background_color_ = SK_ColorWHITE;
   bool has_transparent_background_ = false;
 
+  bool is_fullscreen_ = false;
+
   LayerSelection selection_;
 
   gfx::Size device_viewport_size_;