Tweak priorities of paint invalidation reasons

third_party/WebKit/Source/core/paint/BoxPaintInvalidator.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BoxPaintInvalidator_h
 #define BoxPaintInvalidator_h
 
 #include "platform/graphics/PaintInvalidationReason.h"
 #include "wtf/Allocator.h"
 
@@ skipping 10 matching lines @@
     BoxPaintInvalidator(const LayoutBox& box, const PaintInvalidatorContext& context)
         : m_box(box), m_context(context) { }
 
     static void boxWillBeDestroyed(const LayoutBox&);
 
     PaintInvalidationReason invalidatePaintIfNeeded();
 
 private:
     PaintInvalidationReason computePaintInvalidationReason();
 
-    void incrementallyInvalidatePaint();
+    bool incrementallyInvalidatePaint();
     void invalidatePaintRectClippedByOldAndNewBounds(const LayoutRect&);
 
     bool needsToSavePreviousBoxSizes();
     void savePreviousBoxSizesIfNeeded();
     LayoutSize computePreviousBorderBoxSize(const LayoutSize& previousBoundsSize);
 
     const LayoutBox& m_box;
     const PaintInvalidatorContext& m_context;
 };
 
 } // namespace blink
 
 #endif