SVG animate should respect attribute 'restart=never'.

Source/core/svg/animation/SVGSMILElement.cpp

 /*
  * 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 1112 matching lines @@
 
     if (!m_syncBaseConditionsConnected)
         connectSyncBaseConditions();
 
     if (!m_interval.begin.isFinite()) {
         ASSERT(m_activeState == Inactive);
         m_nextProgressTime = SMILTime::unresolved();
         return false;
     }
 
+    if (!m_isWaitingForFirstInterval && m_activeState != Active && this->restart() == RestartNever) {
+        m_nextProgressTime = SMILTime::unresolved();

[fs, 2015/04/30 13:24:43]

This seems a bit "early" to handle this? Not entirely sure what is actually
being fixed here...

[Shanmuga Pandi, 2015/04/30 13:42:57]

Basically, I am trying to ignore the restart of animation if animation already
ran and completed. So I just returned false. Anyway m_nextProgressTime =
SMILTime::unresolved(); may not seems to be needed.

[fs, 2015/04/30 13:53:42]

Yes, I got that bit. =)
I suspect the problem is really that when a new instance time is added, that a
new interval is computed up front - and that interval should not be valid per
'restart'.

[Shanmuga Pandi, 2015/04/30 14:03:00]

Sorry. Could you give some live example or jsfiddle for this scenario to
understand it better? 

[fs, 2015/04/30 14:05:07]

I think your testcase would should exactly that. I think the relevant code is in
SVGSMILElement::beginListChanged.

+        return false;
+    }
+
     if (elapsed < m_interval.begin) {
         ASSERT(m_activeState != Active);
         bool isFrozen = (m_activeState == Frozen);
         if (isFrozen) {
             if (this == resultElement)
                 resetAnimatedType();
             updateAnimation(m_lastPercent, m_lastRepeat, resultElement);
         }
         m_nextProgressTime = m_interval.begin;
         // If the animation is frozen, it's still contributing.
@@ skipping 210 matching lines @@
     visitor->trace(m_targetElement);
     visitor->trace(m_timeContainer);
     visitor->trace(m_conditions);
     visitor->trace(m_syncBaseDependents);
 #endif
     SVGElement::trace(visitor);
     SVGTests::trace(visitor);
 }
 
 } // namespace blink