Invalidate subsequence caching & empty paint phases if clips changed.

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

Index: third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h
diff --git a/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h b/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h
index 424af9294452ace0bbedbd08bf2d9ea1499cabaa..1cb45093324e2b82a408d7e4ddfebc2a90b593ba 100644
--- a/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h
+++ b/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h
@@ -5,6 +5,7 @@
 #ifndef PrePaintTreeWalk_h
 #define PrePaintTreeWalk_h
 
+#include "core/layout/ClipRect.h"
 #include "core/paint/PaintInvalidator.h"
 #include "core/paint/PaintPropertyTreeBuilder.h"
 
@@ -21,15 +22,28 @@ struct PrePaintTreeWalkContext;
 class PrePaintTreeWalk {
  public:
   PrePaintTreeWalk(GeometryMapper& geometryMapper)
-      : m_paintInvalidator(geometryMapper) {}
+      : m_paintInvalidator(geometryMapper), m_geometryMapper(geometryMapper) {}
   void walk(FrameView& rootFrame);
 
  private:
   void walk(FrameView&, const PrePaintTreeWalkContext&);
   void walk(const LayoutObject&, const PrePaintTreeWalkContext&);
 
+  void invalidatePaintLayerProperties(
+      const LayoutObject&,
+      const PaintLayer& ancestorTransformedOrRootPaintLayer,
+      const PaintPropertyTreeBuilderContext&);
+
+  ClipRect clipRectForContext(
+      const PaintPropertyTreeBuilderContext::ContainingBlockContext&,
+      const EffectPaintPropertyNode*,
+      const PropertyTreeState& ancestorState,
+      const LayoutPoint& ancestorPaintOffset,
+      bool& hasClip);
+
   PaintPropertyTreeBuilder m_propertyTreeBuilder;
   PaintInvalidator m_paintInvalidator;
+  GeometryMapper& m_geometryMapper;
 };
 
 }  // namespace blink