Add a new API for testing animated images

Source/core/svg/animation/SMILTimeContainer.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 531 matching lines @@
 
             if (animDiscard->inDocument()) {
                 animDiscard->remove(IGNORE_EXCEPTION);
                 ASSERT(!animDiscard->inDocument());
             }
         }
     }
     return earliestFireTime;
 }
 
+void SMILTimeContainer::advanceFrameForTesting()
+{
+    setElapsed(elapsed().value() + initialFrameDelay);
+}
+
 DEFINE_TRACE(SMILTimeContainer)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_scheduledAnimations);
 #endif
     visitor->trace(m_ownerSVGElement);
 }
 
 }