Traverse into child LayoutViews during invalidateTreeIfNeeded

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 5340a380b8154b9a30615ee8cfc91ccbcbdfaf6c..11d2285b8f224b9cd4975f590dc44cb7587a8d1c 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -63,6 +63,7 @@ class LayoutEmbeddedObject;
 class LayoutObject;
 class LayoutScrollbarPart;
 class LayoutView;
+class PaintInvalidationState;
 class Page;
 class ScrollingCoordinator;
 class TracedValue;
@@ -598,6 +599,8 @@ protected:
     };
 
 private:
+    friend class LayoutPart; // For invalidateTreeIfNeeded.

[chrishtr, 2015/07/01 19:56:51]

We don't do that elsewhere, since friend classes can access all private methods,
which might lead to a worse outcome. I think it's better to leave it public and
put a note.

[Xianzhu, 2015/07/01 20:10:46]

Done.

+
     explicit FrameView(LocalFrame*);
 
     virtual void setScrollOffset(const IntPoint&, ScrollType) override;
@@ -630,7 +633,7 @@ private:
     void scheduleOrPerformPostLayoutTasks();
     void performPostLayoutTasks();
 
-    void invalidateTreeIfNeeded(Vector<LayoutObject*>& pendingDelayedPaintInvalidations);
+    void invalidateTreeIfNeeded(PaintInvalidationState&);
 
     DocumentLifecycle& lifecycle() const;