Convert SVGSMILElement::m_interval{Begin,End} into a SMILInterval

Source/core/svg/animation/SVGSMILElement.h

 /*
  * Copyright (C) 2008 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 69 matching lines @@
     FillMode fill() const;
 
     SMILTime dur() const;
     SMILTime repeatDur() const;
     SMILTime repeatCount() const;
     SMILTime maxValue() const;
     SMILTime minValue() const;
 
     SMILTime elapsed() const;
 
-    SMILTime intervalBegin() const { return m_intervalBegin; }
+    SMILTime intervalBegin() const { return m_interval.begin; }
     SMILTime previousIntervalBegin() const { return m_previousIntervalBegin; }
     SMILTime simpleDuration() const;
 
     void seekToIntervalCorrespondingToTime(SMILTime elapsed);
     bool progress(SMILTime elapsed, SVGSMILElement* resultsElement, bool seekToTime);
     SMILTime nextProgressTime() const;
 
     void reset();
 
     static SMILTime parseClockValue(const String&);
@@ skipping 136 matching lines @@
     bool m_isWaitingForFirstInterval;
 
     typedef WillBeHeapHashSet<RawPtrWillBeMember<SVGSMILElement> > TimeDependentSet;
     TimeDependentSet m_syncBaseDependents;
 
     // Instance time lists
     Vector<SMILTimeWithOrigin> m_beginTimes;
     Vector<SMILTimeWithOrigin> m_endTimes;
 
     // This is the upcoming or current interval
-    SMILTime m_intervalBegin;
-    SMILTime m_intervalEnd;
+    SMILInterval m_interval;
 
     SMILTime m_previousIntervalBegin;
 
     ActiveState m_activeState;
     float m_lastPercent;
     unsigned m_lastRepeat;
 
     SMILTime m_nextProgressTime;
 
     RefPtrWillBeMember<SMILTimeContainer> m_timeContainer;
@@ skipping 14 matching lines @@
 {
     return node.hasTagName(SVGNames::setTag) || node.hasTagName(SVGNames::animateTag) || node.hasTagName(SVGNames::animateMotionTag)
         || node.hasTagName(SVGNames::animateTransformTag) || node.hasTagName((SVGNames::discardTag));
 }
 
 DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGSMILElement);
 
 }
 
 #endif // SVGSMILElement_h