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diff --git a/layout/style/test/unprefixing_service_utils.js b/layout/style/test/unprefixing_service_utils.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Shared data & functionality used in tests for CSS Unprefixing Service.
+
+// Whitelisted hosts:
+// (per implementation of nsPrincipal::IsOnCSSUnprefixingWhitelist())
+var gWhitelistedHosts = [
+  // test1.example.org is on the whitelist.
+  "test1.example.org",
+  // test2.example.org is on the "allow all subdomains" whitelist.
+  "test2.example.org",
+  "sub1.test2.example.org",
+  "sub2.test2.example.org"
+];
+
+// *NOT* whitelisted hosts:
+var gNotWhitelistedHosts = [
+  // Though test1.example.org is on the whitelist, its subdomains are not.
+  "sub1.test1.example.org",
+  // mochi.test is not on the whitelist.
+  "mochi.test:8888"
+];
+
+// Names of prefs:
+const PREF_UNPREFIXING_SERVICE =
+  "layout.css.unprefixing-service.enabled";
+const PREF_INCLUDE_TEST_DOMAINS =
+  "layout.css.unprefixing-service.include-test-domains";
+
+// Helper-function to make unique URLs in testHost():
+var gCounter = 0;
+function getIncreasingCounter() {
+  return gCounter++;
+}
+
+// This function tests a particular host in our iframe.
+// @param aHost           The host to be tested
+// @param aExpectEnabled  Should we expect unprefixing to be enabled for host?
+function testHost(aHost, aExpectEnabled) {
+  // Build the URL:
+  let url = window.location.protocol; // "http:" or "https:"
+  url += "//";
+  url += aHost;
+
+  // Append the path-name, up to the actual filename (the final "/"):
+  const re = /(.*\/).*/;
+  url += window.location.pathname.replace(re, "$1");
+  url += IFRAME_TESTFILE;
+  // In case this is the same URL as last time, we add "?N" for some unique N,
+  // to make each URL different, so that the iframe actually (re)loads:
+  url += "?" + getIncreasingCounter();
+  // We give the URL a #suffix to indicate to the test whether it should expect
+  // that unprefixing is enabled or disabled:
+  url += (aExpectEnabled ? "#expectEnabled" : "#expectDisabled");
+
+  let iframe = document.getElementById("testIframe");
+  iframe.contentWindow.location = url;
+  // The iframe will report its results back via postMessage.
+  // Our caller had better have set up a postMessage listener.
+}
+
+// Register a postMessage() handler, to allow our cross-origin iframe to
+// communicate back to the main page's mochitest functionality.
+// The handler expects postMessage to be called with an object like:
+//   { type: ["is"|"ok"|"testComplete"], ... }
+// The "is" and "ok" types will trigger the corresponding function to be
+// called in the main page, with named arguments provided in the payload.
+// The "testComplete" type will trigger the passed-in aTestCompleteCallback
+// function to be invoked (e.g. to advance to the next testcase, or to finish
+// the overall test, as-appropriate).
+function registerPostMessageListener(aTestCompleteCallback) {
+  let receiveMessage = function(event) {
+    if (event.data.type === "is") {
+      is(event.data.actual, event.data.expected, event.data.desc);
+    } else if (event.data.type === "ok") {
+      ok(event.data.condition, event.data.desc);
+    } else if (event.data.type === "testComplete") {
+      aTestCompleteCallback();
+    } else {
+      ok(false, "unrecognized data in postMessage call");
+    }
+  };
+
+  window.addEventListener("message", receiveMessage, false);
+}