Optimize layout/repaint on FrameView resize

Source/core/frame/FrameView.h

Index: Source/core/frame/FrameView.h
diff --git a/Source/core/frame/FrameView.h b/Source/core/frame/FrameView.h
index 07ccb28aa615c5404ea1573685f16da955149182..e5067801edc12667547ace4c55c52c80d6808132 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -101,6 +101,7 @@ public:
 
     bool needsLayout() const;
     void setNeedsLayout();
+    void setNeedsResizeLayout();
 
     // Methods for getting/setting the size Blink should use to layout the contents.
     IntSize layoutSize(IncludeScrollbarsInRect = ExcludeScrollbars) const;
@@ -265,6 +266,7 @@ public:
     void setTracksRepaints(bool);
     bool isTrackingRepaints() const { return m_isTrackingRepaints; }
     void resetTrackedRepaints();
+    const Vector<IntRect>& trackedRepaintRects() const { return m_trackedRepaintRects; }
     String trackedRepaintRectsAsText() const;
 
     typedef HashSet<ScrollableArea*> ScrollableAreaSet;