Hide fullscreen rotation jank

content/browser/renderer_host/render_widget_host_view_android.h

Index: content/browser/renderer_host/render_widget_host_view_android.h
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index 8a7c1cc5754d3f1f880aadd8363a3e89155608f6..8ef393b2df0262893c22ac57936f5594f66ebb59 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -340,6 +340,10 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   void CreateOverscrollControllerIfPossible();
 
+  bool CheckForFullscreenTransitionJank(
+      const cc::CompositorFrameMetadata& metadata);
+  std::unique_ptr<cc::RenderPass> CreateBlackRenderPass();
+
   // The model object.
   RenderWidgetHostImpl* host_;
 
@@ -426,6 +430,10 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   base::WeakPtrFactory<RenderWidgetHostViewAndroid> weak_ptr_factory_;
 
+  bool was_fullscreen_ = false;
+  bool fullscreen_transitioning_ = false;
+  gfx::Size prev_physical_backing_size_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };