Add support for patternUnits attribute.

The patternUnits attribute defines how a pattern's coordinate system is
defined (x, y, width, height). This is particularly important when using
repeatable patterns in SVG. This commit adds this attribute to the lists
of known properties.

Closes facebook#1548

Author: nhunzaker

src/browser/ui/dom/SVGDOMPropertyConfig.js

@@ -37,6 +37,7 @@ var SVGDOMPropertyConfig = {
     gradientTransform: MUST_USE_ATTRIBUTE,
     gradientUnits: MUST_USE_ATTRIBUTE,
     offset: MUST_USE_ATTRIBUTE,
+    patternUnits: MUST_USE_ATTRIBUTE,
     points: MUST_USE_ATTRIBUTE,
     preserveAspectRatio: MUST_USE_ATTRIBUTE,
     r: MUST_USE_ATTRIBUTE,
@@ -63,6 +64,7 @@ var SVGDOMPropertyConfig = {
   DOMAttributeNames: {
     gradientTransform: 'gradientTransform',
     gradientUnits: 'gradientUnits',
+    patternUnits: 'patternUnits',
     preserveAspectRatio: 'preserveAspectRatio',
     spreadMethod: 'spreadMethod',
     stopColor: 'stop-color',