Getting started on the fuzzer web front end.

res/js/common.js

 /**
  * common.js is a set of common functions used across all of skiaperf.
  *
  * Everything is scoped to 'sk' except $$ and $$$ which are global since they
  * are used so often.
  *
  */
 
 /**
  * $$ returns a real JS array of DOM elements that match the CSS query selector.
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     });
   }
 
   // Capitalize each word in the string.
   sk.toCapWords = function(s) {
     return s.replace(/\b\w/g, function(firstLetter) {
       return firstLetter.toUpperCase();
     });
   }
 
+  // Polyfill for String.startsWith from 
+  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith#Polyfill
+  // returns true iff the string starts with the given prefix
+  if (!String.prototype.startsWith) {
+    String.prototype.startsWith = function(searchString, position) {
+      position = position || 0;
+      return this.indexOf(searchString, position) === position;
+    };
+  }
   return sk;
 }();