Expose crypto.getRandomValues() to workers.

LayoutTests/crypto/resources/random-values.js

+if (self.importScripts) {
+    importScripts('../../fast/js/resources/js-test-pre.js');
+}
+
+description("Tests crypto.randomValues.");
+
+if (!self.ArrayBuffer)
+    debug("This test requres ArrayBuffers to run!");
+
+shouldBe("'crypto' in self", "true");
+shouldBe("'getRandomValues' in self.crypto", "true");
+
+try {
+    // NOTE: This test is flaky.  If we ran this test every second since the
+    //       beginning of the universe, on average, it would have failed
+    //       2^{-748} times.
+
+    var reference = new Uint8Array(100);
+    var sample = new Uint8Array(100);
+
+    crypto.getRandomValues(reference);
+    crypto.getRandomValues(sample);
+
+    var matchingBytes = 0;
+
+    for (var i = 0; i < reference.length; i++) {
+        if (reference[i] == sample[i])
+            matchingBytes++;
+    }
+
+    shouldBe("matchingBytes < 100", "true");
+} catch(ex) {
+    debug(ex);
+}
+
+finishJSTest();