RenderLayer::hasVisibleDescendant should ASSERT(!m_visibleDescendantStatusDirty)

Source/core/rendering/RenderLayer.h

Index: Source/core/rendering/RenderLayer.h
diff --git a/Source/core/rendering/RenderLayer.h b/Source/core/rendering/RenderLayer.h
index db73ce9a6e3eeb1679274b67e8033e34c988dde3..e5f2a4875d1c5e22b0d1335ae1f8aad16c99b2bf 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -174,7 +174,7 @@ public:
     // FIXME: We should ASSERT(!m_visibleContentStatusDirty) here, but see https://bugs.webkit.org/show_bug.cgi?id=71044
     // ditto for hasVisibleDescendant(), see https://bugs.webkit.org/show_bug.cgi?id=71277
     bool hasVisibleContent() const { return m_hasVisibleContent; }
-    bool hasVisibleDescendant() const { return m_hasVisibleDescendant; }
+    bool hasVisibleDescendant() const { ASSERT(!m_visibleDescendantStatusDirty); return m_hasVisibleDescendant; }
 
     void setHasVisibleContent();
     void dirtyVisibleContentStatus();
@@ -507,6 +507,7 @@ public:
     void setShouldIsolateCompositedDescendants(bool);
 
     void updateDescendantDependentFlags();
+    void updateDescendantDependentFlagsForEntireSubtree();
 
     void updateOrRemoveFilterEffectRenderer();