diff -r 000000000000 -r 6474c204b198 mobile/android/modules/Accounts.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/modules/Accounts.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,76 @@
+/* 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/. */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["Accounts"];
+
+const { utils: Cu } = Components;
+
+Cu.import("resource://gre/modules/Messaging.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/Promise.jsm");
+
+/**
+ * A promise-based API for querying the existence of Sync accounts,
+ * and accessing the Sync setup wizard.
+ *
+ * Usage:
+ *
+ *   Cu.import("resource://gre/modules/Accounts.jsm");
+ *   Accounts.anySyncAccountsExist().then(
+ *     (exist) => {
+ *       console.log("Accounts exist? " + exist);
+ *       if (!exist) {
+ *         Accounts.launchSetup();
+ *       }
+ *     },
+ *     (err) => {
+ *       console.log("We failed so hard.");
+ *     }
+ *   );
+ */
+let Accounts = Object.freeze({
+  _accountsExist: function (kind) {
+    let deferred = Promise.defer();
+
+    sendMessageToJava({
+      type: "Accounts:Exist",
+      kind: kind,
+    }, (data, error) => {
+      if (error) {
+        deferred.reject(error);
+      } else {
+        deferred.resolve(data.exists);
+      }
+    });
+
+    return deferred.promise;
+  },
+
+  firefoxAccountsExist: function () {
+    return this._accountsExist("fxa");
+  },
+
+  syncAccountsExist: function () {
+    return this._accountsExist("sync11");
+  },
+
+  anySyncAccountsExist: function () {
+    return this._accountsExist("any");
+  },
+
+  /**
+   * Fire-and-forget: open the Firefox accounts activity, which
+   * will be the Getting Started screen if FxA isn't yet set up.
+   *
+   * There is no return value from this method.
+   */
+  launchSetup: function () {
+    sendMessageToJava({
+      type: "Accounts:Create",
+    });
+  },
+});
+