Lazy load chrome.* APIs

chrome/renderer/resources/extensions/extension_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 extension API.
+// Custom binding for the extension API.
+
+var binding = require('binding').Binding.create('extension');
 
 var extensionNatives = requireNative('extension');
 var GetExtensionViews = extensionNatives.GetExtensionViews;
 var runtimeNatives = requireNative('runtime');
 var OpenChannelToExtension = runtimeNatives.OpenChannelToExtension;
 var OpenChannelToNativeApp = runtimeNatives.OpenChannelToNativeApp;
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
+var chrome = requireNative('chrome').GetChrome();
 var sendMessageUpdateArguments =
     require('miscellaneous_bindings').sendMessageUpdateArguments;
 
 var inIncognitoContext = requireNative('process').InIncognitoContext();
 var sendRequestIsDisabled = requireNative('process').IsSendRequestDisabled();
 var contextType = requireNative('process').GetContextType();
-
-chrome.extension = chrome.extension || {};
-
 var manifestVersion = requireNative('process').GetManifestVersion();
-if (manifestVersion < 2) {
-  chrome.self = chrome.extension;
-  chrome.extension.inIncognitoTab = inIncognitoContext;
-}
-
-chrome.extension.inIncognitoContext = inIncognitoContext;
 
 // This should match chrome.windows.WINDOW_ID_NONE.
 //
 // We can't use chrome.windows.WINDOW_ID_NONE directly because the
 // chrome.windows API won't exist unless this extension has permission for it;
 // which may not be the case.
 var WINDOW_ID_NONE = -1;
 
-chromeHidden.registerCustomHook('extension',
-                                function(bindingsAPI, extensionId) {
+binding.registerCustomHook(function(bindingsAPI, extensionId) {
+  var extension = bindingsAPI.compiledApi;
+  if (manifestVersion < 2) {
+    chrome.self = extension;
+    extension.inIncognitoTab = inIncognitoContext;
+  }
+  extension.inIncognitoContext = inIncognitoContext;
+
   var apiFunctions = bindingsAPI.apiFunctions;
 
   apiFunctions.setHandleRequest('getViews', function(properties) {
     var windowId = WINDOW_ID_NONE;
     var type = 'ALL';
     if (properties) {
       if (properties.type != null) {
         type = properties.type;
       }
       if (properties.windowId != null) {
@@ skipping 27 matching lines @@
     // Functions
     'connect', 'sendMessage', 'connectNative', 'sendNativeMessage',
     // Events
     'onConnect', 'onConnectExternal', 'onMessage', 'onMessageExternal'
   ];
   mayNeedAlias.forEach(function(alias) {
     // Checking existence isn't enough since some functions are disabled via
     // getters that throw exceptions. Assume that any getter is such a function.
     if (chrome.runtime.hasOwnProperty(alias) &&
         chrome.runtime.__lookupGetter__(alias) === undefined) {
-      chrome.extension[alias] = chrome.runtime[alias];
+      extension[alias] = chrome.runtime[alias];
     }
   });
 
   apiFunctions.setUpdateArgumentsPreValidate('sendRequest',
       sendMessageUpdateArguments.bind(null, 'sendRequest'));
 
   apiFunctions.setHandleRequest('sendRequest',
                                 function(targetId, request, responseCallback) {
     if (sendRequestIsDisabled)
       throw new Error(sendRequestIsDisabled);
     var port = chrome.runtime.connect(targetId || extensionId,
                                       {name: chromeHidden.kRequestChannel});
     chromeHidden.Port.sendMessageImpl(port, request, responseCallback);
   });
 
   if (sendRequestIsDisabled) {
-    chrome.extension.onRequest.addListener = function() {
+    extension.onRequest.addListener = function() {
       throw new Error(sendRequestIsDisabled);
     };
     if (contextType == 'BLESSED_EXTENSION') {
-      chrome.extension.onRequestExternal.addListener = function() {
+      extension.onRequestExternal.addListener = function() {
         throw new Error(sendRequestIsDisabled);
       };
     }
   }
+});
 
-});
+exports.binding = binding.generate();