diff -r 000000000000 -r 6474c204b198 dom/browser-element/mochitest/browserElementTestHelpers.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/browser-element/mochitest/browserElementTestHelpers.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,574 @@
+/* Any copyright is dedicated to the public domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Helpers for managing the browser frame preferences.
+"use strict";
+
+function _getPath() {
+  return window.location.pathname
+               .substring(0, window.location.pathname.lastIndexOf('/'))
+               .replace("/priority", "");
+}
+
+const browserElementTestHelpers = {
+  _getBoolPref: function(pref) {
+    try {
+      return SpecialPowers.getBoolPref(pref);
+    }
+    catch (e) {
+      return undefined;
+    }
+  },
+
+  _setPref: function(pref, value) {
+    this.lockTestReady();
+    if (value !== undefined && value !== null) {
+      SpecialPowers.pushPrefEnv({'set': [[pref, value]]}, this.unlockTestReady.bind(this));
+    } else {
+      SpecialPowers.pushPrefEnv({'clear': [[pref]]}, this.unlockTestReady.bind(this));
+    }
+  },
+
+  _setPrefs: function() {
+    this.lockTestReady();
+    SpecialPowers.pushPrefEnv({'set': Array.slice(arguments)}, this.unlockTestReady.bind(this));
+  },
+
+  _testReadyLockCount: 0,
+  _firedTestReady: false,
+  lockTestReady: function() {
+    this._testReadyLockCount++;
+  },
+
+  unlockTestReady: function() {
+    this._testReadyLockCount--;
+    if (this._testReadyLockCount == 0 && !this._firedTestReady) {
+      this._firedTestReady = true;
+      dispatchEvent(new Event("testready"));
+    }
+  },
+
+  enableProcessPriorityManager: function() {
+    this._setPrefs(
+      ['dom.ipc.processPriorityManager.testMode', true],
+      ['dom.ipc.processPriorityManager.enabled', true],
+      ['dom.ipc.processPriorityManager.backgroundLRUPoolLevels', 2]
+    );
+  },
+
+  setEnabledPref: function(value) {
+    this._setPref('dom.mozBrowserFramesEnabled', value);
+  },
+
+  getOOPByDefaultPref: function() {
+    return this._getBoolPref("dom.ipc.browser_frames.oop_by_default");
+  },
+
+  addPermission: function() {
+    SpecialPowers.addPermission("browser", true, document);
+    this.tempPermissions.push(location.href)
+  },
+
+  'tempPermissions': [],
+  addPermissionForUrl: function(url) {
+    SpecialPowers.addPermission("browser", true, url);
+    this.tempPermissions.push(url);
+  },
+
+  _observers: [],
+
+  // This function is a wrapper which lets you register an observer to one of
+  // the process priority manager's test-only topics.  observerFn should be a
+  // function which takes (subject, topic, data).
+  //
+  // We'll clean up any observers you add at the end of the test.
+  addProcessPriorityObserver: function(processPriorityTopic, observerFn) {
+    var topic = "process-priority-manager:TEST-ONLY:" + processPriorityTopic;
+
+    // SpecialPowers appears to require that the observer be an object, not a
+    // function.
+    var observer = {
+      observe: observerFn
+    };
+
+    SpecialPowers.addObserver(observer, topic, /* weak = */ false);
+    this._observers.push([observer, topic]);
+  },
+
+  cleanUp: function() {
+    for (var i = 0; i < this.tempPermissions.length; i++) {
+      SpecialPowers.removePermission("browser", this.tempPermissions[i]);
+    }
+
+    for (var i = 0; i < this._observers.length; i++) {
+      SpecialPowers.removeObserver(this._observers[i][0],
+                                   this._observers[i][1]);
+    }
+  },
+
+  // Some basically-empty pages from different domains you can load.
+  'emptyPage1': 'http://example.com' + _getPath() + '/file_empty.html',
+  'emptyPage2': 'http://example.org' + _getPath() + '/file_empty.html',
+  'emptyPage3': 'http://test1.example.org' + _getPath() + '/file_empty.html',
+  'focusPage': 'http://example.org' + _getPath() + '/file_focus.html',
+};
+
+// Returns a promise which is resolved when a subprocess is created.  The
+// argument to resolve() is the childID of the subprocess.
+function expectProcessCreated() {
+  var deferred = Promise.defer();
+
+  var observed = false;
+  browserElementTestHelpers.addProcessPriorityObserver(
+    "process-created",
+    function(subject, topic, data) {
+      // Don't run this observer twice, so we don't ok(true) twice.  (It's fine
+      // to resolve a promise twice; the second resolve() call does nothing.)
+      if (observed) {
+        return;
+      }
+      observed = true;
+
+      var childID = parseInt(data);
+      ok(true, 'Got new process, id=' + childID);
+      deferred.resolve(childID);
+    }
+  );
+
+  return deferred.promise;
+}
+
+// Just like expectProcessCreated(), except we'll call ok(false) if a second
+// process is created.
+function expectOnlyOneProcessCreated() {
+  var p = expectProcessCreated();
+  p.then(function() {
+    expectProcessCreated().then(function(childID) {
+      ok(false, 'Got unexpected process creation, childID=' + childID);
+    });
+  });
+  return p;
+}
+
+// Returns a promise which is resolved or rejected the next time the process
+// childID changes its priority.  We resolve if the (priority, CPU priority)
+// tuple matches (expectedPriority, expectedCPUPriority) and we reject
+// otherwise.
+//
+// expectedCPUPriority is an optional argument; if it's not specified, we
+// resolve if priority matches expectedPriority.
+
+function expectPriorityChange(childID, expectedPriority,
+                              /* optional */ expectedCPUPriority) {
+  var deferred = Promise.defer();
+
+  var observed = false;
+  browserElementTestHelpers.addProcessPriorityObserver(
+    'process-priority-set',
+    function(subject, topic, data) {
+      if (observed) {
+        return;
+      }
+
+      var [id, priority, cpuPriority] = data.split(":");
+      if (id != childID) {
+        return;
+      }
+
+      // Make sure we run the is() calls in this observer only once, otherwise
+      // we'll expect /every/ priority change to match expectedPriority.
+      observed = true;
+
+      is(priority, expectedPriority,
+         'Expected priority of childID ' + childID +
+         ' to change to ' + expectedPriority);
+
+      if (expectedCPUPriority) {
+        is(cpuPriority, expectedCPUPriority,
+           'Expected CPU priority of childID ' + childID +
+           ' to change to ' + expectedCPUPriority);
+      }
+
+      if (priority == expectedPriority &&
+          (!expectedCPUPriority || expectedCPUPriority == cpuPriority)) {
+        deferred.resolve();
+      } else {
+        deferred.reject();
+      }
+    }
+  );
+
+  return deferred.promise;
+}
+
+// Returns a promise which is resolved or rejected the next time the background
+// process childID changes its priority.  We resolve if the backgroundLRU
+// matches expectedBackgroundLRU and we reject otherwise.
+
+function expectPriorityWithBackgroundLRUSet(childID, expectedBackgroundLRU) {
+  var deferred = Promise.defer();
+
+  browserElementTestHelpers.addProcessPriorityObserver(
+    'process-priority-with-background-LRU-set',
+    function(subject, topic, data) {
+
+      var [id, priority, cpuPriority, backgroundLRU] = data.split(":");
+      if (id != childID) {
+        return;
+      }
+
+      is(backgroundLRU, expectedBackgroundLRU,
+         'Expected backgroundLRU ' + backgroundLRU + ' of childID ' + childID +
+         ' to change to ' + expectedBackgroundLRU);
+
+      if (backgroundLRU == expectedBackgroundLRU) {
+        deferred.resolve();
+      } else {
+        deferred.reject();
+      }
+    }
+  );
+
+  return deferred.promise;
+}
+
+// Returns a promise which is resolved the first time the given iframe fires
+// the mozbrowser##eventName event.
+function expectMozbrowserEvent(iframe, eventName) {
+  var deferred = Promise.defer();
+  iframe.addEventListener('mozbrowser' + eventName, function handler(e) {
+    iframe.removeEventListener('mozbrowser' + eventName, handler);
+    deferred.resolve(e);
+  });
+  return deferred.promise;
+}
+
+// Set some prefs:
+//
+//  * browser.pagethumbnails.capturing_disabled: true
+//
+//    Disable tab view; it seriously messes us up.
+//
+//  * dom.ipc.browser_frames.oop_by_default
+//
+//    Enable or disable OOP-by-default depending on the test's filename.  You
+//    can still force OOP on or off with <iframe mozbrowser remote=true/false>,
+//    at least until bug 756376 lands.
+//
+//  * dom.ipc.tabs.disabled: false
+//
+//    Allow us to create OOP frames.  Even if they're not the default, some
+//    "in-process" tests create OOP frames.
+//
+//  * network.disable.ipc.security: true
+//
+//    Disable the networking security checks; our test harness just tests
+//    browser elements without sticking them in apps, and the security checks
+//    dislike that.
+//
+//    Unfortunately setting network.disable.ipc.security to false before the
+//    child process(es) created by this test have shut down can cause us to
+//    assert and kill the child process.  That doesn't cause the tests to fail,
+//    but it's still scary looking.  So we just set the pref to true and never
+//    pop that value.  We'll rely on the tests which test IPC security to set
+//    it to false.
+//
+//  * security.mixed_content.block_active_content: false
+//
+//    Disable mixed active content blocking, so that tests can confirm that mixed
+//    content results in a broken security state.
+
+(function() {
+  var oop = location.pathname.indexOf('_inproc_') == -1;
+
+  browserElementTestHelpers.lockTestReady();
+  SpecialPowers.setBoolPref("network.disable.ipc.security", true);
+  SpecialPowers.pushPrefEnv({set: [["browser.pagethumbnails.capturing_disabled", true],
+                                   ["dom.ipc.browser_frames.oop_by_default", oop],
+                                   ["dom.ipc.tabs.disabled", false],
+                                   ["security.mixed_content.block_active_content", false]]},
+                            browserElementTestHelpers.unlockTestReady.bind(browserElementTestHelpers));
+})();
+
+addEventListener('unload', function() {
+  browserElementTestHelpers.cleanUp();
+});
+
+// Wait for the load event before unlocking the test-ready event.
+browserElementTestHelpers.lockTestReady();
+addEventListener('load', function() {
+  SimpleTest.executeSoon(browserElementTestHelpers.unlockTestReady.bind(browserElementTestHelpers));
+});
+
+//////////////////////////////////
+// promise.js from the addon SDK with some modifications to the module
+// boilerplate.
+//////////////////////////////////
+
+;(function(id, factory) { // Module boilerplate :(
+    var globals = this;
+    factory(function require(id) {
+      return globals[id];
+    }, (globals[id] = {}), { uri: document.location.href + '#' + id, id: id });
+}).call(this, 'Promise', function Promise(require, exports, module) {
+
+'use strict';
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+/**
+ * Internal utility: Wraps given `value` into simplified promise, successfully
+ * fulfilled to a given `value`. Note the result is not a complete promise
+ * implementation, as its method `then` does not returns anything.
+ */
+function fulfilled(value) {
+  return { then: function then(fulfill) { fulfill(value); } };
+}
+
+/**
+ * Internal utility: Wraps given input into simplified promise, pre-rejected
+ * with a given `reason`. Note the result is not a complete promise
+ * implementation, as its method `then` does not returns anything.
+ */
+function rejected(reason) {
+  return { then: function then(fulfill, reject) { reject(reason); } };
+}
+
+/**
+ * Internal utility: Returns `true` if given `value` is a promise. Value is
+ * assumed to be a promise if it implements method `then`.
+ */
+function isPromise(value) {
+  return value && typeof(value.then) === 'function';
+}
+
+/**
+ * Creates deferred object containing fresh promise & methods to either resolve
+ * or reject it. The result is an object with the following properties:
+ * - `promise` Eventual value representation implementing CommonJS [Promises/A]
+ *   (http://wiki.commonjs.org/wiki/Promises/A) API.
+ * - `resolve` Single shot function that resolves enclosed `promise` with a
+ *   given `value`.
+ * - `reject` Single shot function that rejects enclosed `promise` with a given
+ *   `reason`.
+ *
+ * An optional `prototype` argument is used as a prototype of the returned
+ * `promise` allowing one to implement additional API. If prototype is not
+ * passed then it falls back to `Object.prototype`.
+ *
+ *  ## Example
+ *
+ *  function fetchURI(uri, type) {
+ *    var deferred = defer();
+ *    var request = new XMLHttpRequest();
+ *    request.open("GET", uri, true);
+ *    request.responseType = type;
+ *    request.onload = function onload() {
+ *      deferred.resolve(request.response);
+ *    }
+ *    request.onerror = function(event) {
+ *     deferred.reject(event);
+ *    }
+ *    request.send();
+ *
+ *    return deferred.promise;
+ *  }
+ */
+function defer(prototype) {
+  // Define FIFO queue of observer pairs. Once promise is resolved & all queued
+  // observers are forwarded to `result` and variable is set to `null`.
+  var observers = [];
+
+  // Promise `result`, which will be assigned a resolution value once promise
+  // is resolved. Note that result will always be assigned promise (or alike)
+  // object to take care of propagation through promise chains. If result is
+  // `null` promise is not resolved yet.
+  var result = null;
+
+  prototype = (prototype || prototype === null) ? prototype : Object.prototype;
+
+  // Create an object implementing promise API.
+  var promise = Object.create(prototype, {
+    then: { value: function then(onFulfill, onError) {
+      var deferred = defer(prototype);
+
+      function resolve(value) {
+        // If `onFulfill` handler is provided resolve `deferred.promise` with
+        // result of invoking it with a resolution value. If handler is not
+        // provided propagate value through.
+        try {
+          deferred.resolve(onFulfill ? onFulfill(value) : value);
+        }
+        // `onFulfill` may throw exception in which case resulting promise
+        // is rejected with thrown exception.
+        catch(error) {
+          if (exports._reportErrors && typeof(console) === 'object')
+            console.error(error);
+          // Note: Following is equivalent of `deferred.reject(error)`,
+          // we use this shortcut to reduce a stack.
+          deferred.resolve(rejected(error));
+        }
+      }
+
+      function reject(reason) {
+        try {
+          if (onError) deferred.resolve(onError(reason));
+          else deferred.resolve(rejected(reason));
+        }
+        catch(error) {
+          if (exports._reportErrors && typeof(console) === 'object')
+            console.error(error)
+          deferred.resolve(rejected(error));
+        }
+      }
+
+      // If enclosed promise (`this.promise`) observers queue is still alive
+      // enqueue a new observer pair into it. Note that this does not
+      // necessary means that promise is pending, it may already be resolved,
+      // but we still have to queue observers to guarantee an order of
+      // propagation.
+      if (observers) {
+        observers.push({ resolve: resolve, reject: reject });
+      }
+      // Otherwise just forward observer pair right to a `result` promise.
+      else {
+        result.then(resolve, reject);
+      }
+
+      return deferred.promise;
+    }}
+  })
+
+  var deferred = {
+    promise: promise,
+    /**
+     * Resolves associated `promise` to a given `value`, unless it's already
+     * resolved or rejected. Note that resolved promise is not necessary a
+     * successfully fulfilled. Promise may be resolved with a promise `value`
+     * in which case `value` promise's fulfillment / rejection will propagate
+     * up to a promise resolved with `value`.
+     */
+    resolve: function resolve(value) {
+      if (!result) {
+        // Store resolution `value` in a `result` as a promise, so that all
+        // the subsequent handlers can be simply forwarded to it. Since
+        // `result` will be a promise all the value / error propagation will
+        // be uniformly taken care of.
+        result = isPromise(value) ? value : fulfilled(value);
+
+        // Forward already registered observers to a `result` promise in the
+        // order they were registered. Note that we intentionally dequeue
+        // observer at a time until queue is exhausted. This makes sure that
+        // handlers registered as side effect of observer forwarding are
+        // queued instead of being invoked immediately, guaranteeing FIFO
+        // order.
+        while (observers.length) {
+          var observer = observers.shift();
+          result.then(observer.resolve, observer.reject);
+        }
+
+        // Once `observers` queue is exhausted we `null`-ify it, so that
+        // new handlers are forwarded straight to the `result`.
+        observers = null;
+      }
+    },
+    /**
+     * Rejects associated `promise` with a given `reason`, unless it's already
+     * resolved / rejected. This is just a (better performing) convenience
+     * shortcut for `deferred.resolve(reject(reason))`.
+     */
+    reject: function reject(reason) {
+      // Note that if promise is resolved that does not necessary means that it
+      // is successfully fulfilled. Resolution value may be a promise in which
+      // case its result propagates. In other words if promise `a` is resolved
+      // with promise `b`, `a` is either fulfilled or rejected depending
+      // on weather `b` is fulfilled or rejected. Here `deferred.promise` is
+      // resolved with a promise pre-rejected with a given `reason`, there for
+      // `deferred.promise` is rejected with a given `reason`. This may feel
+      // little awkward first, but doing it this way greatly simplifies
+      // propagation through promise chains.
+      deferred.resolve(rejected(reason));
+    }
+  };
+
+  return deferred;
+}
+exports.defer = defer;
+
+/**
+ * Returns a promise resolved to a given `value`. Optionally a second
+ * `prototype` argument may be provided to be used as a prototype for the
+ * returned promise.
+ */
+function resolve(value, prototype) {
+  var deferred = defer(prototype);
+  deferred.resolve(value);
+  return deferred.promise;
+}
+exports.resolve = resolve;
+
+/**
+ * Returns a promise rejected with a given `reason`. Optionally a second
+ * `prototype` argument may be provided to be used as a prototype for the
+ * returned promise.
+ */
+function reject(reason, prototype) {
+  var deferred = defer(prototype);
+  deferred.reject(reason);
+  return deferred.promise;
+}
+exports.reject = reject;
+
+var promised = (function() {
+  // Note: Define shortcuts and utility functions here in order to avoid
+  // slower property accesses and unnecessary closure creations on each
+  // call of this popular function.
+
+  var call = Function.call;
+  var concat = Array.prototype.concat;
+
+  // Utility function that does following:
+  // execute([ f, self, args...]) => f.apply(self, args)
+  function execute(args) { return call.apply(call, args) }
+
+  // Utility function that takes promise of `a` array and maybe promise `b`
+  // as arguments and returns promise for `a.concat(b)`.
+  function promisedConcat(promises, unknown) {
+    return promises.then(function(values) {
+      return resolve(unknown).then(function(value) {
+        return values.concat([ value ])
+      });
+    });
+  }
+
+  return function promised(f, prototype) {
+    /**
+    Returns a wrapped `f`, which when called returns a promise that resolves to
+    `f(...)` passing all the given arguments to it, which by the way may be
+    promises. Optionally second `prototype` argument may be provided to be used
+    a prototype for a returned promise.
+
+    ## Example
+
+    var promise = promised(Array)(1, promise(2), promise(3))
+    promise.then(console.log) // => [ 1, 2, 3 ]
+    **/
+
+    return function promised() {
+      // create array of [ f, this, args... ]
+      return concat.apply([ f, this ], arguments).
+        // reduce it via `promisedConcat` to get promised array of fulfillments
+        reduce(promisedConcat, resolve([], prototype)).
+        // finally map that to promise of `f.apply(this, args...)`
+        then(execute);
+    }
+  }
+})();
+exports.promised = promised;
+
+var all = promised(Array);
+exports.all = all;
+
+});