Refactor UI "badge" (page action) logic into a BadgeController interface.

chrome/browser/extensions/page_action_controller.h

Index: chrome/browser/extensions/page_action_controller.h
diff --git a/chrome/browser/extensions/page_action_controller.h b/chrome/browser/extensions/page_action_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..904d23577eb9f8e37ed392ef3c58bd946e971608
--- /dev/null
+++ b/chrome/browser/extensions/page_action_controller.h
@@ -0,0 +1,36 @@
+// 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_BROWSER_EXTENSIONS_PAGE_ACTION_CONTROLLER_H_
+#define CHROME_BROWSER_EXTENSIONS_PAGE_ACTION_CONTROLLER_H_
+#pragma once
+
+#include "chrome/browser/extensions/badge_controller.h"
+
+class ExtensionService;
+class TabContentsWrapper;
+
+namespace extensions {
+
+// A BadgeController which corresponds to the page actions of an extension.
+class PageActionController : public BadgeController {
+ public:
+  explicit PageActionController(TabContentsWrapper* tab_contents);
+  virtual ~PageActionController();
+
+  virtual scoped_ptr<DataList> GetAllBadgeData() OVERRIDE;
+
+  virtual Reaction OnClicked(const std::string& extension_id,
+                             int button_type) OVERRIDE;
+
+ private:
+  // Gets the ExtensionService for |tab_contents_|.
+  ExtensionService* GetExtensionService();
+
+  TabContentsWrapper* tab_contents_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_PAGE_ACTION_CONTROLLER_H_