Expose requireAsync method and make it more robust

extensions/renderer/module_system.h

 // 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.
 
 #ifndef EXTENSIONS_RENDERER_MODULE_SYSTEM_H_
 #define EXTENSIONS_RENDERER_MODULE_SYSTEM_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 174 matching lines @@
   // Return a promise for a requested module.
   // |args[0]| - the name of a module.
   void RequireAsync(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   // Wraps |source| in a (function(define, require, requireNative, ...) {...}).
   v8::Handle<v8::String> WrapSource(v8::Handle<v8::String> source);
 
   // NativeHandler implementation which returns the private area of an Object.
   void Private(const v8::FunctionCallbackInfo<v8::Value>& args);
 
-  // Loads and runs a Javascript module.
-  v8::Handle<v8::Value> LoadModule(const std::string& module_name);
+  // Runs a Javascript module.
+  v8::Handle<v8::Value> LoadModule(const std::string& module_name,
+                                   v8::Handle<v8::Value> module_source);
 
   // Invoked when a module is loaded in response to a requireAsync call.
   // Resolves |resolver| with |value|.
   void OnModuleLoaded(
       scoped_ptr<v8::UniquePersistent<v8::Promise::Resolver> > resolver,
       v8::Handle<v8::Value> value);
 
   // gin::ModuleRegistryObserver overrides.
   void OnDidAddPendingModule(
       const std::string& id,
@@ skipping 19 matching lines @@
   std::set<std::string> overridden_native_handlers_;
 
   base::WeakPtrFactory<ModuleSystem> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ModuleSystem);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_MODULE_SYSTEM_H_