Bug 1443092 - Avoid calling SVGAnimatedEnumeration::AnimVal() from nsSVGUtils::GetBBox(). r=jwatt, a=RyanVM

AnimVal() is a DOM getter, and it flushes animations, which we don't want
in GetBBox() which is called from display list building cide and
FrameLayerBuilder.

MozReview-Commit-ID: DWgm7wAV7C0

dom/svg/SVGClipPathElement.cpp

@@ -50,6 +50,13 @@ SVGClipPathElement::GetEnumInfo()
                             ArrayLength(sEnumInfo));
 }
 
+bool
+SVGClipPathElement::IsUnitsObjectBoundingBox() const
+{
+  return mEnumAttributes[CLIPPATHUNITS].GetAnimValue() == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;
+}
+
+
 //----------------------------------------------------------------------
 // nsIDOMNode methods