Restrict floats over SVGSVGElement to finite values.

Source/core/svg/SVGSVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 135 matching lines @@
     const FrameTree& frameTree = frame->tree();
 
     // The behaviour of currentScale() is undefined, when we're dealing with non-standalone SVG documents.
     // If the svg is embedded, the scaling is handled by the host renderer, so when asking from inside
     // the SVG document, a scale value of 1 seems reasonable, as it doesn't know anything about the parent scale.
     return frameTree.parent() ? 1 : frame->pageZoomFactor();
 }
 
 void SVGSVGElement::setCurrentScale(float scale)
 {
+    ASSERT(std::isfinite(scale));
     if (!inDocument() || !isOutermostSVGSVGElement())
         return;
 
     LocalFrame* frame = document().frame();
     if (!frame)
         return;
 
     const FrameTree& frameTree = frame->tree();
 
     // The behaviour of setCurrentScale() is undefined, when we're dealing with non-standalone SVG documents.
@@ skipping 405 matching lines @@
     return m_timeContainer->isPaused();
 }
 
 float SVGSVGElement::getCurrentTime() const
 {
     return narrowPrecisionToFloat(m_timeContainer->elapsed().value());
 }
 
 void SVGSVGElement::setCurrentTime(float seconds)
 {
-    if (std::isnan(seconds))
-        return;
+    ASSERT(std::isfinite(seconds));
     seconds = max(seconds, 0.0f);
     m_timeContainer->setElapsed(seconds);
 }
 
 bool SVGSVGElement::selfHasRelativeLengths() const
 {
     return m_x->currentValue()->isRelative()
         || m_y->currentValue()->isRelative()
         || m_width->currentValue()->isRelative()
         || m_height->currentValue()->isRelative()
@@ skipping 178 matching lines @@
     visitor->trace(m_width);
     visitor->trace(m_height);
     visitor->trace(m_translation);
     visitor->trace(m_timeContainer);
     visitor->trace(m_viewSpec);
     SVGGraphicsElement::trace(visitor);
     SVGFitToViewBox::trace(visitor);
 }
 
 } // namespace blink