Don't use cached subsequence when clip changes

third_party/WebKit/Source/core/layout/ClipRects.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 58 matching lines @@
     void setFixed(bool fixed) { m_fixed = fixed ? 1 : 0; }
 
     bool operator==(const ClipRects& other) const
     {
         return m_overflowClipRect == other.overflowClipRect()
             && m_fixedClipRect == other.fixedClipRect()
             && m_posClipRect == other.posClipRect()
             && fixed() == other.fixed();
     }
 
+    bool operator!=(const ClipRects& other) const { return !(*this == other); }
+
     ClipRects& operator=(const ClipRects& other)
     {
         m_overflowClipRect = other.overflowClipRect();
         m_fixedClipRect = other.fixedClipRect();
         m_posClipRect = other.posClipRect();
         m_fixed = other.fixed();
         return *this;
     }
 
 private:
@@ skipping 15 matching lines @@
 
     ClipRect m_overflowClipRect;
     ClipRect m_fixedClipRect;
     ClipRect m_posClipRect;
     unsigned m_fixed;
 };
 
 } // namespace blink
 
 #endif // ClipRects_h