mediawiki.debug: Fix crash in browsers without Function#bind

PhantomJS has a partial ECMAScript 5 implementation but it does
not include Function.prototype.bind.  Detect that and error gracefully
instead of erroring out in the middle of a phantomjs qunit run.

Change-Id: Ic06e08490e8f297fda479c4adaf9b2d8735f63ad

diff --git a/resources/src/mediawiki/mediawiki.debug.profile.js b/resources/src/mediawiki/mediawiki.debug.profile.js
index 64ec6c3..b4d5773 100644 (file)
--- a/resources/src/mediawiki/mediawiki.debug.profile.js
+++ b/resources/src/mediawiki/mediawiki.debug.profile.js
@@ -70,10 +70,10 @@
                 * @param string tag to create
                 * @return DOMElement
                 */
-               createSvgElement: document.createElementNS
+               createSvgElement: ( document.createElementNS && Function.prototype.bind )
                        ? document.createElementNS.bind( document, 'http://www.w3.org/2000/svg' )
                        // throw a error for browsers which does not support document.createElementNS (IE<8)
-                       : function () { throw new Error( 'document.createElementNS not supported' ); },
+                       : function () { throw new Error( 'An ES5 compatible javascript engine is required for the profile visualization.' ); },
 
                /**
                 * @param DOMElement|undefined