Add a new API for testing animated images

Source/core/svg/graphics/SVGImage.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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.
@@ skipping 377 matching lines @@
 }
 
 bool SVGImage::hasAnimations() const
 {
     SVGSVGElement* rootElement = svgRootElement(m_page.get());
     if (!rootElement)
         return false;
     return rootElement->timeContainer()->hasAnimations() || toLocalFrame(m_page->mainFrame())->document()->timeline().hasPendingUpdates();
 }
 
+void SVGImage::advanceAnimationForTesting()
+{
+    if (SVGSVGElement* rootElement = svgRootElement(m_page.get())) {
+        rootElement->timeContainer()->advanceFrameForTesting();
+
+        // The following triggers animation updates which can issue a new draw
+        // but will not perminately change the animation timeline.

[fs, 2015/09/08 14:50:57]

s/perminately/permanently/ ?

[pdr., 2015/09/08 22:50:37]

Nice catch. Fixed.

+        // TODO(pdr): Actually advance the document timeline so CSS animations

[fs, 2015/09/08 14:50:57]

Doing this would also "advance" the SMILTimeContainer (since it hangs off the
same base clock).

+        // can be properly tested.
+        rootElement->document().page()->animator().serviceScriptedAnimations(rootElement->getCurrentTime());
+        imageObserver()->animationAdvanced(this);
+    }
+}
+
 void SVGImage::updateUseCounters(Document& document) const
 {
     if (SVGSVGElement* rootElement = svgRootElement(m_page.get())) {
         if (rootElement->timeContainer()->hasAnimations())
             UseCounter::countDeprecation(document, UseCounter::SVGSMILAnimationInImageRegardlessOfCache);
     }
 }
 
 bool SVGImage::dataChanged(bool allDataReceived)
 {
@@ skipping 71 matching lines @@
 
     return m_page;
 }
 
 String SVGImage::filenameExtension() const
 {
     return "svg";
 }
 
 }