Add an extensions keep-alive client.

extensions/renderer/resources/binding.js

 // Copyright 2014 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.
 
 var Event = require('event_bindings').Event;
 var forEach = require('utils').forEach;
 var GetAvailability = requireNative('v8_context').GetAvailability;
 var exceptionHandler = require('uncaught_exception_handler');
 var lastError = require('lastError');
 var logActivity = requireNative('activityLogger');
@@ skipping 55 matching lines @@
 
 APIFunctions.prototype.setHandleRequestWithPromise =
     function(apiName, customizedFunction) {
   var prefix = this.namespace;
   return this.setHook_(apiName, 'handleRequest', function() {
       var name = prefix + '.' + apiName;
       logActivity.LogAPICall(extensionId, name, $Array.slice(arguments));
       var stack = exceptionHandler.getExtensionStackTrace();
       var callback = arguments[arguments.length - 1];
       var args = $Array.slice(arguments, 0, arguments.length - 1);
+      var keepAlivePromise = requireAsync('keep_alive').then(function(module) {
+        return module.createKeepAlive();
+      });
       $Function.apply(customizedFunction, this, args).then(function(result) {
         sendRequestHandler.safeCallbackApply(
             name, {'stack': stack}, callback, [result]);
       }).catch(function(error) {
         var message = exceptionHandler.safeErrorToString(error, true);
         lastError.run(name, message, stack, callback);
+      }).then(function() {
+        keepAlivePromise.then(function(keepAlive) {
+          keepAlive.close();
+        });
       });
     });
 };
 
 APIFunctions.prototype.setUpdateArgumentsPostValidate =
     function(apiName, customizedFunction) {
   return this.setHook_(
     apiName, 'updateArgumentsPostValidate', customizedFunction);
 };
 
@@ skipping 380 matching lines @@
                     availability.message);
       return;
     }
 
     this.runHooks_(mod);
     return mod;
   }
 };
 
 exports.Binding = Binding;