Convert SVGSMILElement::resolveInterval to return an 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 129 matching lines @@
     virtual void updateAnimation(float percent, unsigned repeat, SVGSMILElement* resultElement) = 0;
 
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
 
     enum BeginOrEnd {
         Begin,
         End
     };
 
     SMILTime findInstanceTime(BeginOrEnd, SMILTime minimumTime, bool equalsMinimumOK) const;
+
+    enum ResolveInterval {
+        FirstInterval,
+        NextInterval
+    };
+
+    SMILInterval resolveInterval(ResolveInterval) const;
     void resolveFirstInterval();
     bool resolveNextInterval();
-    void resolveInterval(bool first, SMILTime& beginResult, SMILTime& endResult) const;
     SMILTime resolveActiveEnd(SMILTime resolvedBegin, SMILTime resolvedEnd) const;
     SMILTime repeatingDuration() const;
 
     enum RestartedInterval {
         DidNotRestartInterval,
         DidRestartInterval
     };
 
     RestartedInterval maybeRestartInterval(SMILTime elapsed);
     void beginListChanged(SMILTime eventTime);
@@ skipping 109 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