diff -r 000000000000 -r 6474c204b198 b2g/components/WebappsUpdater.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/b2g/components/WebappsUpdater.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,100 @@
+/* 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 = ["WebappsUpdater"];
+
+const Cc = Components.classes;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyServiceGetter(this, "settings",
+                                   "@mozilla.org/settingsService;1",
+                                   "nsISettingsService");
+
+XPCOMUtils.defineLazyModuleGetter(this, "SystemAppProxy",
+                                  "resource://gre/modules/SystemAppProxy.jsm");
+
+function debug(aStr) {
+  //dump("--*-- WebappsUpdater: " + aStr);
+}
+
+this.WebappsUpdater = {
+  _checkingApps: false,
+
+  handleContentStart: function() {
+  },
+
+  sendChromeEvent: function(aType, aDetail) {
+    let detail = aDetail || {};
+    detail.type = aType;
+
+    let sent = SystemAppProxy.dispatchEvent(detail);
+    if (!sent) {
+      debug("Warning: Couldn't send update event " + aType +
+          ": no content browser. Will send again when content becomes available.");
+      return false;
+    }
+
+    return true;
+  },
+
+  _appsUpdated: function(aApps) {
+    debug("appsUpdated: " + aApps.length + " apps to update");
+    let lock = settings.createLock();
+    lock.set("apps.updateStatus", "check-complete", null);
+    this.sendChromeEvent("apps-update-check", { apps: aApps });
+    this._checkingApps = false;
+  },
+
+  // Trigger apps update check and wait for all to be done before
+  // notifying gaia.
+  updateApps: function() {
+    debug("updateApps (" + this._checkingApps + ")");
+    // Don't start twice.
+    if (this._checkingApps) {
+      return;
+    }
+
+    this._checkingApps = true;
+
+    let self = this;
+
+    let window = Services.wm.getMostRecentWindow("navigator:browser");
+    let all = window.navigator.mozApps.mgmt.getAll();
+
+    all.onsuccess = function() {
+      let appsCount = this.result.length;
+      let appsChecked = 0;
+      let appsToUpdate = [];
+      this.result.forEach(function updateApp(aApp) {
+        let update = aApp.checkForUpdate();
+        update.onsuccess = function() {
+          if (aApp.downloadAvailable) {
+            appsToUpdate.push(aApp.manifestURL);
+          }
+
+          appsChecked += 1;
+          if (appsChecked == appsCount) {
+            self._appsUpdated(appsToUpdate);
+          }
+        }
+        update.onerror = function() {
+          appsChecked += 1;
+          if (appsChecked == appsCount) {
+            self._appsUpdated(appsToUpdate);
+          }
+        }
+      });
+    }
+
+    all.onerror = function() {
+      // Could not get the app list, just notify to update nothing.
+      self._appsUpdated([]);
+    }
+  }
+};