Add a choice not to crash when unexpected dirty layout is encountered

third_party/WebKit/Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 123 matching lines @@
     void clearLayoutSubtreeRoot(const LayoutObject&);
     void addOrthogonalWritingModeRoot(LayoutBox&);
     void removeOrthogonalWritingModeRoot(LayoutBox&);
     bool hasOrthogonalWritingModeRoots() const;
     void layoutOrthogonalWritingModeRoots();
     int layoutCount() const { return m_layoutCount; }
 
     void countObjectsNeedingLayout(unsigned& needsLayoutObjects, unsigned& totalObjects, bool& isPartial);
 
     bool needsLayout() const;
-    void checkDoesNotNeedLayout() const;
+    bool checkDoesNotNeedLayout() const;
     void setNeedsLayout();
 
     void setNeedsUpdateWidgetGeometries() { m_needsUpdateWidgetGeometries = true; }
 
     // Methods for getting/setting the size Blink should use to layout the contents.
     // NOTE: Scrollbar exclusion is based on the FrameView's scrollbars. To exclude
     // scrollbars on the root PaintLayer, use LayoutView::layoutSize.
     IntSize layoutSize(IncludeScrollbarsInRect = ExcludeScrollbars) const;
     void setLayoutSize(const IntSize&);
 
@@ skipping 618 matching lines @@
     void setNeedsUpdateViewportIntersection();
     void updateViewportIntersectionsForSubtree(DocumentLifecycle::LifecycleState targetState);
     void updateViewportIntersectionIfNeeded();
     void notifyRenderThrottlingObservers();
     void updateThrottlingStatus();
     void notifyResizeObservers();
 
     // PaintInvalidationCapableScrollableArea
     LayoutScrollbarPart* resizer() const override { return nullptr; }
 
-    void checkLayoutInvalidationIsAllowed() const;
+    bool checkLayoutInvalidationIsAllowed() const;
 
     LayoutSize m_size;
 
     typedef HashSet<RefPtr<LayoutEmbeddedObject>> EmbeddedObjectSet;
     EmbeddedObjectSet m_partUpdateSet;
 
     // FIXME: These are just "children" of the FrameView and should be Member<Widget> instead.
     HashSet<RefPtr<LayoutPart>> m_parts;
 
     // The RefPtr cycle between LocalFrame and FrameView is broken
@@ skipping 169 matching lines @@
     if (m_visuallyNonEmptyPixelCount > visualPixelThreshold)
         setIsVisuallyNonEmpty();
 }
 
 DEFINE_TYPE_CASTS(FrameView, Widget, widget, widget->isFrameView(), widget.isFrameView());
 DEFINE_TYPE_CASTS(FrameView, ScrollableArea, scrollableArea, scrollableArea->isFrameView(), scrollableArea.isFrameView());
 
 } // namespace blink
 
 #endif // FrameView_h