Lazy load chrome.* APIs

chrome/renderer/resources/extensions/runtime_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 runtime API.
+// Custom binding for the runtime API.
+
+var binding = require('binding').Binding.create('runtime');
 
 var runtimeNatives = requireNative('runtime');
 var extensionNatives = requireNative('extension');
 var GetExtensionViews = extensionNatives.GetExtensionViews;
 var OpenChannelToExtension = runtimeNatives.OpenChannelToExtension;
 var OpenChannelToNativeApp = runtimeNatives.OpenChannelToNativeApp;
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 var sendMessageUpdateArguments =
     require('miscellaneous_bindings').sendMessageUpdateArguments;
 
-chromeHidden.registerCustomHook('runtime', function(bindings, id, contextType) {
-  var apiFunctions = bindings.apiFunctions;
+binding.registerCustomHook(function(binding, id, contextType) {
+  var apiFunctions = binding.apiFunctions;
+  var runtime = binding.compiledApi;
 
   //
   // Unprivileged APIs.
   //
 
-  chrome.runtime.id = id;
+  runtime.id = id;
 
   apiFunctions.setHandleRequest('getManifest', function() {
     return runtimeNatives.GetManifest();
   });
 
   apiFunctions.setHandleRequest('getURL', function(path) {
     path = String(path);
     if (!path.length || path[0] != '/')
       path = '/' + path;
     return 'chrome-extension://' + id + path;
   });
 
   apiFunctions.setUpdateArgumentsPreValidate('sendMessage',
       sendMessageUpdateArguments.bind(null, 'sendMessage'));
   apiFunctions.setUpdateArgumentsPreValidate('sendNativeMessage',
       sendMessageUpdateArguments.bind(null, 'sendNativeMessage'));
 
   apiFunctions.setHandleRequest('sendMessage',
                                 function(targetId, message, responseCallback) {
-    var port = chrome.runtime.connect(targetId || chrome.runtime.id,
+    var port = runtime.connect(targetId || runtime.id,
         {name: chromeHidden.kMessageChannel});
     chromeHidden.Port.sendMessageImpl(port, message, responseCallback);
   });
 
   apiFunctions.setHandleRequest('sendNativeMessage',
                                 function(targetId, message, responseCallback) {
-    var port = chrome.runtime.connectNative(targetId);
+    var port = runtime.connectNative(targetId);
     chromeHidden.Port.sendMessageImpl(port, message, responseCallback);
   });
 
   apiFunctions.setUpdateArgumentsPreValidate('connect', function() {
     // Align missing (optional) function arguments with the arguments that
     // schema validation is expecting, e.g.
     //   runtime.connect()   -> runtime.connect(null, null)
     //   runtime.connect({}) -> runtime.connect(null, {})
     var nextArg = 0;
 
@@ skipping 15 matching lines @@
   apiFunctions.setUpdateArgumentsPreValidate('connectNative',
                                              function(appName) {
     if (typeof(appName) !== 'string') {
       throw new Error('Invalid arguments to connectNative.');
     }
     return [appName];
   });
 
   apiFunctions.setHandleRequest('connect', function(targetId, connectInfo) {
     if (!targetId)
-      targetId = chrome.runtime.id;
+      targetId = runtime.id;
     var name = '';
     if (connectInfo && connectInfo.name)
       name = connectInfo.name;
 
     // Don't let orphaned content scripts communicate with their extension.
     // http://crbug.com/168263
     if (!chromeHidden.wasUnloaded) {
-      var portId = OpenChannelToExtension(chrome.runtime.id, targetId, name);
+      var portId = OpenChannelToExtension(runtime.id, targetId, name);
       if (portId >= 0)
         return chromeHidden.Port.createPort(portId, name);
     }
     throw new Error('Error connecting to extension ' + targetId);
   });
 
   //
   // Privileged APIs.
   //
   if (contextType != 'BLESSED_EXTENSION')
     return;
 
   apiFunctions.setHandleRequest('connectNative',
                                 function(nativeAppName) {
     if (!chromeHidden.wasUnloaded) {
-      var portId = OpenChannelToNativeApp(chrome.runtime.id, nativeAppName);
+      var portId = OpenChannelToNativeApp(runtime.id, nativeAppName);
       if (portId >= 0)
         return chromeHidden.Port.createPort(portId, '');
     }
     throw new Error('Error connecting to native app: ' + nativeAppName);
   });
 
   apiFunctions.setCustomCallback('getBackgroundPage',
                                  function(name, request, response) {
     if (request.callback) {
       var bg = GetExtensionViews(-1, 'BACKGROUND')[0] || null;
       request.callback(bg);
     }
     request.callback = null;
   });
 
 });
+
+exports.binding = binding.generate();