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 3919895a6828d8c904ec6b3b02882d122154aaf6..0dbcd0e168668bcae141edaf9957210bc5c7e7d7 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -137,6 +137,8 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
   void SetVisible(bool visible);
   bool IsVisible() const;
 
+  void SetIsFullscreen(bool is_fullscreen);
+
   // Called in response to an CompositorFrameSink request made to the client
   // using LayerTreeHostClient::RequestNewCompositorFrameSink. The client will
   // be informed of the CompositorFrameSink initialization status using
@@ -538,6 +540,7 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
   LayerTreeDebugState debug_state_;
 
   bool visible_ = false;
+  bool is_fullscreen_ = false;
 
   bool has_gpu_rasterization_trigger_ = false;
   bool content_is_suitable_for_gpu_rasterization_ = true;