Implement a module system for the extension bindings JS.

chrome/renderer/resource_bundle_source_map.h

Index: chrome/renderer/resource_bundle_source_map.h
diff --git a/chrome/renderer/resource_bundle_source_map.h b/chrome/renderer/resource_bundle_source_map.h
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+++ b/chrome/renderer/resource_bundle_source_map.h
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+// Copyright (c) 2012 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 CHROME_RENDERER_RESOURCE_BUNDLE_SOURCE_MAP_H_
+#define CHROME_RENDERER_RESOURCE_BUNDLE_SOURCE_MAP_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "base/memory/linked_ptr.h"
+#include "base/string_piece.h"
+#include "chrome/renderer/module_system.h"
+#include "chrome/renderer/static_v8_external_string_resource.h"
+#include "v8/include/v8.h"
+
+#include <map>
+#include <string>
+
+namespace ui {
+  class ResourceBundle;
+}
+
+class ResourceBundleSourceMap : public ModuleSystem::SourceMap {
+ public:
+  explicit ResourceBundleSourceMap(const ui::ResourceBundle* resource_bundle);
+  ~ResourceBundleSourceMap();
+
+  virtual v8::Handle<v8::Value> GetSource(const std::string& name) OVERRIDE;
+  virtual bool Contains(const std::string& name) OVERRIDE;
+
+  void RegisterSource(const std::string& name, int resource_id);
+
+ private:
+  v8::Handle<v8::String> ConvertString(const base::StringPiece& string);
+
+  const ui::ResourceBundle* resource_bundle_;
+  std::map<std::string, int> resource_id_map_;
+};
+
+#endif  // CHROME_RENDERER_RESOURCE_BUNDLE_SOURCE_MAP_H_