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 c5cf9d70df876c9abfbee6658f456b7abaafd833..7c39e4d5d249d9c9ff7fda6eab60c412310d40c7 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -345,6 +345,10 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   void CreateOverscrollControllerIfPossible();
 
+  bool CheckForFullscreenTransitionJank(
+      const cc::CompositorFrameMetadata& metadata);
+  std::unique_ptr<cc::RenderPass> CreateBlackRenderPass();
+
   // The model object.
   RenderWidgetHostImpl* host_;
 
@@ -424,6 +428,10 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
   float prev_top_shown_pix_;
   float prev_bottom_shown_pix_;
 
+  bool was_fullscreen_ = false;
+  bool fullscreen_transitioning_ = false;
+  gfx::Size prev_physical_backing_size_;
+
   cc::mojom::MojoCompositorFrameSinkClient* renderer_compositor_frame_sink_ =
       nullptr;