[cc-frame-viewer] Add gl-matrix to third_party [redux]

tools/cc-frame-viewer/third_party/gl-matrix/spec/helpers/spec-helper.js

+var HELPER_MATCHERS = (function() {
+  var EPSILON = 0.00001;
+  
+  return {
+    /*
+      Returns true if `actual` has the same length as `expected`, and
+      if each element of both arrays is within 0.000001 of each other.
+      This is a way to check for "equal enough" conditions, as a way
+      of working around floating point imprecision.
+    */
+    toBeEqualish: function(expected) {
+      if (typeof(this.actual) == 'number')
+        return Math.abs(this.actual - expected) < EPSILON;
+
+      if (this.actual.length != expected.length) return false;
+      for (var i = 0; i < this.actual.length; i++) {
+        if (isNaN(this.actual[i]) !== isNaN(expected[i]))
+          return false;
+        if (Math.abs(this.actual[i] - expected[i]) >= EPSILON)
+          return false;
+      }
+      return true;
+    }
+  };
+})();
+
+beforeEach(function() {
+  this.addMatchers(HELPER_MATCHERS);
+});
+
+if (typeof(global) != 'undefined')
+  global.HELPER_MATCHERS = HELPER_MATCHERS;