[gin] Introduce Wrappable::GetObjectTemplate

mojo/apps/js/bindings/gl/context.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 MOJO_APPS_JS_BINDINGS_GL_CONTEXT_H_
 #define MOJO_APPS_JS_BINDINGS_GL_CONTEXT_H_
 
 #include <GLES2/gl2.h>
 
 #include "gin/handle.h"
@@ skipping 12 matching lines @@
 
 typedef Opaque Shader;
 
 // Context implements WebGLRenderingContext.
 class Context : public gin::Wrappable<Context> {
  public:
   static gin::WrapperInfo kWrapperInfo;
 
   static gin::Handle<Context> Create(v8::Isolate* isolate, uint64_t encoded,
                                      int width, int height);
-  static v8::Handle<v8::ObjectTemplate> GetObjectTemplate(v8::Isolate* isolate);
-
   static gin::Handle<Shader> CreateShader(const gin::Arguments& arguments,
                                           GLenum type);
   static void ShaderSource(gin::Handle<Shader> shader,
                            const std::string& source);
   static void CompileShader(const gin::Arguments& arguments,
                             gin::Handle<Shader> shader);
 
  private:
+  friend class gin::Wrappable<Context>;
+  static v8::Local<v8::ObjectTemplate> GetObjectTemplate(v8::Isolate* isolate);
+
   Context(uint64_t encoded, int width, int height);
 
   uint64_t encoded_;
 };
 
 }  // namespace gl
 }  // namespace js
 }  // namespace mojo
 
 #endif  // MOJO_APPS_JS_BINDINGS_GL_CONTEXT_H_