Replacing WebUIBindings use of CPPBoundClass with v8::Extension.

content/renderer/web_ui_extension_data.h

+// 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 CONTENT_RENDERER_EXTENSIONS_WEBUI_EXTENSION_DATA_H_
+#define CONTENT_RENDERER_EXTENSIONS_WEBUI_EXTENSION_DATA_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+#include "content/public/renderer/render_view_observer.h"
+#include "content/public/renderer/render_view_observer_tracker.h"
+
+namespace content {
+
+class WebUIExtensionData
+    : public RenderViewObserver,
+      public RenderViewObserverTracker<WebUIExtensionData> {
+ public:
+  explicit WebUIExtensionData(RenderView* render_view);
+  virtual ~WebUIExtensionData();
+
+  // Returns value for a given |key|. Will return an empty string if no such key
+  // exists in the |variable_map_|.
+  string16 GetValue(const string16& key) const;
+
+ private:
+  // RenderViewObserver implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  void OnSetWebUIProperty(const std::string& name, const std::string& value);
+
+  std::map<string16, string16> variable_map_;

[Evan Stade, 2012/11/07 00:33:54]

why is this UTF16 instead of UTF8? seems v8 can accept either one, and it's
easier to leave this as utf8 since that's the format OnSetWebUIProperty expects.

[Shishir, 2012/11/07 01:53:30]

Changed to utf8. The V8 string objects seem string16 based so I initially wrote
this to be consistent with v8. But it makes sense to have this compatible with
SetWebUI calls.

+
+  DISALLOW_COPY_AND_ASSIGN(WebUIExtensionData);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_EXTENSIONS_WEBUI_EXTENSION_DATA_H_