Lazy load chrome.* APIs

chrome/renderer/resources/extensions/app_custom_bindings.js

Index: chrome/renderer/resources/extensions/app_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/app_custom_bindings.js b/chrome/renderer/resources/extensions/app_custom_bindings.js
index 1a8bbcc7d6dab3ecaf05cee5574a61aed13e9ca4..0b9dd89b41df7b8d0edb9b402419f2e58c5140cf 100644
--- a/chrome/renderer/resources/extensions/app_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/app_custom_bindings.js
@@ -2,9 +2,11 @@
 // 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.
+// Custom binding for the app API.
 
 var appNatives = requireNative('app');
+var chrome = requireNative('chrome').GetChrome();
+var GetAvailability = requireNative('v8_context').GetAvailability;
 
 // This becomes chrome.app
 var app = {
@@ -43,7 +45,7 @@ var chromeHiddenApp = {
 
 // appNotification stuff.
 //
-// TODO(kalman): move this stuff to its own custom bindings.
+// TODO(kalman): move this stuff to its own custom binding.
 // 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 = {};
@@ -67,8 +69,11 @@ app.installState = function getInstallState(callback) {
   appNatives.GetInstallState(callbackId);
 };
 
-// These must match the names in InstallAppBindings() in
+// These must match the names in InstallAppbinding() in
 // chrome/renderer/extensions/dispatcher.cc.
-exports.chromeApp = app;
-exports.chromeAppNotifications = appNotifications;
-exports.chromeHiddenApp = chromeHiddenApp;
+var availability = GetAvailability('app');
+if (availability.is_available) {
+  exports.chromeApp = app;
+  exports.chromeAppNotifications = appNotifications;
+  exports.chromeHiddenApp = chromeHiddenApp;
+}