Move page action manifest parsing out of Extension; the first multi-key manifest handler.

chrome/common/extensions/api/extension_action/page_action_handler.h

+// Copyright (c) 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 CHROME_COMMON_EXTENSIONS_API_EXTENSION_ACTION_PAGE_ACTION_HANDLER_H_
+#define CHROME_COMMON_EXTENSIONS_API_EXTENSION_ACTION_PAGE_ACTION_HANDLER_H_
+
+#include <string>
+
+#include "chrome/common/extensions/api/extension_action/action_info.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/manifest_handler.h"
+
+namespace extensions {
+
+// Parses the "page_action" manifest key.
+class PageActionHandler : public ManifestMultiKeyHandler {
+ public:
+  PageActionHandler();
+  virtual ~PageActionHandler();
+
+  virtual bool Parse(const base::DictionaryValue* value,
+                     Extension* extension,
+                     string16* error) OVERRIDE;
+
+  virtual const ManifestMultiKeyHandler::KeySet key_set() OVERRIDE;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_API_EXTENSION_ACTION_PAGE_ACTION_HANDLER_H_