Avoid layout/full-repaint on view height change if possible

Source/core/rendering/RenderView.h

Index: Source/core/rendering/RenderView.h
diff --git a/Source/core/rendering/RenderView.h b/Source/core/rendering/RenderView.h
index 8da5c9dcf9ec475f19bfb473899fc422997da95f..48b17d16844cada40d0f15f77f6427414ddfe632 100644
--- a/Source/core/rendering/RenderView.h
+++ b/Source/core/rendering/RenderView.h
@@ -208,6 +208,8 @@ public:
     LayoutUnit viewportPercentageMin(float percentage) const;
     LayoutUnit viewportPercentageMax(float percentage) const;
 
+    void viewResized();
+
 private:
     virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0) const OVERRIDE;
     virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const OVERRIDE;
@@ -274,6 +276,8 @@ private:
 
     bool shouldUsePrintingLayout() const;
 
+    bool needsLayoutOnLogicalHeightChange() const;
+
     FrameView* m_frameView;
 
     RenderObject* m_selectionStart;