Implement Mojo message codec in JavaScript

gin/modules/module_runner_delegate.h

 // Copyright 2013 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 GIN_MODULES_MODULE_RUNNER_DELEGATE_H_
 #define GIN_MODULES_MODULE_RUNNER_DELEGATE_H_
 
+#include <map>
+
 #include "base/compiler_specific.h"
 #include "gin/modules/file_module_provider.h"
 #include "gin/runner.h"
 
 namespace gin {
 
+typedef v8::Local<v8::ObjectTemplate> (*ModuleTemplateGetter)(
+    v8::Isolate* isolate);
+
 class ModuleRunnerDelegate : public RunnerDelegate {
  public:
   explicit ModuleRunnerDelegate(const base::FilePath& module_base);
   virtual ~ModuleRunnerDelegate();
 
+  void AddBuiltinModule(const std::string& id, ModuleTemplateGetter templ);
+
  private:
+  typedef std::map<std::string, ModuleTemplateGetter> BuiltinModuleMap;
+
   // From RunnerDelegate:
   virtual v8::Handle<v8::ObjectTemplate> GetGlobalTemplate(
       Runner* runner) OVERRIDE;
+  virtual void DidCreateContext(Runner* runner) OVERRIDE;
   virtual void DidRunScript(Runner* runner,
                             v8::Handle<v8::Script> script) OVERRIDE;
 
+  BuiltinModuleMap builtin_modules_;
   FileModuleProvider module_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(ModuleRunnerDelegate);
 };
 
 }  // namespace gin
 
 #endif  // GIN_MODULES_MODULE_RUNNER_DELEGATE_H_