Add support for wrapping classes indirectly inherited from gin::Wrappable<T>

mojo/apps/js/bindings/gl/context.cc

 // 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.
 
 #include "mojo/apps/js/bindings/gl/context.h"
 
 #include <GLES2/gl2.h>
 
 #include "gin/arguments.h"
 #include "gin/object_template_builder.h"
 #include "mojo/public/gles2/gles2.h"
 
 namespace mojo {
 namespace js {
 namespace gl {
 
 gin::WrapperInfo Context::kWrapperInfo = { gin::kEmbedderNativeGin };
 
 gin::Handle<Context> Context::Create(v8::Isolate* isolate, uint64_t encoded,
                                      int width, int height) {
   return gin::CreateHandle(isolate, new Context(encoded, width, height));
 }
 
-v8::Local<v8::ObjectTemplate> Context::GetObjectTemplate(
-    v8::Isolate* isolate) {
-  return gin::ObjectTemplateBuilder(isolate)
-      .SetValue("VERTEX_SHADER", GL_VERTEX_SHADER)
-      .SetMethod("createShader", CreateShader)
-      .SetMethod("shaderSource", ShaderSource)
-      .SetMethod("compileShader", CompileShader)
-      .Build();
-}
-
 gin::Handle<Shader> Context::CreateShader(const gin::Arguments& args,
                                           GLenum type) {
   gin::Handle<Shader> result;
   GLuint glshader = glCreateShader(type);
   if (glshader != 0u) {
     result = Opaque::Create(args.isolate(), glshader);
   }
   return result;
 }
 
 void Context::ShaderSource(gin::Handle<Shader> shader,
                            const std::string& source) {
   const char* source_chars = source.c_str();
   glShaderSource(shader->value(), 1, &source_chars, NULL);
 }
 
 void Context::CompileShader(const gin::Arguments& args,
                             gin::Handle<Shader> shader) {
   glCompileShader(shader->value());
   GLint compiled = 0;
   glGetShaderiv(shader->value(), GL_COMPILE_STATUS, &compiled);
   if (!compiled) {
     // Or should |shader| do it when it is destroyed?
     glDeleteShader(shader->value());
     args.ThrowTypeError("Could not compile shader");
     return;
   }
 }
 
+gin::ObjectTemplateBuilder Context::GetObjectTemplateBuilder(
+    v8::Isolate* isolate) {
+  return gin::Wrappable<Context>::GetObjectTemplateBuilder(isolate)
+      .SetValue("VERTEX_SHADER", GL_VERTEX_SHADER)
+      .SetMethod("createShader", CreateShader)
+      .SetMethod("shaderSource", ShaderSource)
+      .SetMethod("compileShader", CompileShader);
+}
+
 Context::Context(uint64_t encoded, int width, int height)
     : encoded_(encoded) {
   // TODO(aa): When we want to support multiple contexts, we should add
   // Context::MakeCurrent() for developers to switch between them.
   MojoGLES2MakeCurrent(encoded_);
 }
 
 }  // namespace gl
 }  // namespace js
 }  // namespace mojo