Add an API for hosted apps to check their install and running states.

chrome/renderer/resources/extensions/app_custom_bindings.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Custom bindings for the app API.
 
 var appNatives = requireNative('app');
 
 // This becomes chrome.app
 var app = {
   getIsInstalled: appNatives.GetIsInstalled,
   install: appNatives.Install,
   getDetails: appNatives.GetDetails,
-  getDetailsForFrame: appNatives.GetDetailsForFrame
+  getDetailsForFrame: appNatives.GetDetailsForFrame,
+  runningState: appNatives.GetRunningState
 };
 
 // Tricky; "getIsInstalled" is actually exposed as the getter "isInstalled",
 // but we don't have a way to express this in the schema JSON (nor is it
 // worth it for this one special case).
 //
 // So, define it manually, and let the getIsInstalled function act as its
 // documentation.
 app.__defineGetter__('isInstalled', appNatives.GetIsInstalled);
 
 // Called by app_bindings.cc.
 // This becomes chromeHidden.app
 var chromeHiddenApp = {
   onGetAppNotifyChannelResponse: function(channelId, error, callbackId) {
     if (callbackId) {
       callbacks[callbackId](channelId, error);
       delete callbacks[callbackId];
     }
+  },
+
+  onInstallStateResponse: function(state, callbackId) {
+    if (callbackId) {
+      callbacks[callbackId](state);
+      delete callbacks[callbackId];
+    }
   }
 };
 
 // appNotification stuff.
 //
 // TODO(kalman): move this stuff to its own custom bindings.
 // It will be bit tricky since I'll need to look into why there are
 // permissions defined for app notifications, yet this always sets it up?
 var callbacks = {};
 var nextCallbackId = 1;
 
 // This becomes chrome.appNotifications.
 var appNotifications = {
   getChannel: function getChannel(clientId, callback) {
     var callbackId = 0;
     if (callback) {
       callbackId = nextCallbackId++;
       callbacks[callbackId] = callback;
     }
     appNatives.GetAppNotifyChannel(clientId, callbackId);
   }
 };
 
+app.installState = function getInstallState(callback) {
+  var callbackId = nextCallbackId++;
+  callbacks[callbackId] = callback;
+  appNatives.GetInstallState(callbackId);
+};
+
 // These must match the names in InstallAppBindings() in
 // extension_dispatcher.cc.
 exports.chromeApp = app;
 exports.chromeAppNotifications = appNotifications;
 exports.chromeHiddenApp = chromeHiddenApp;