Move the parsing of homepage_url" and "devtools_page" out of Extension.

chrome/common/extensions/manifest_url_handler.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 CHROME_COMMON_EXTENSIONS_MANIFEST_URL_HANDLER_H_
+#define CHROME_COMMON_EXTENSIONS_MANIFEST_URL_HANDLER_H_
+
+#include <string>
+
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/manifest_handler.h"
+
+namespace extensions {
+
+// A structure to hold various URLs(devtools_page, homepage_url, etc)

[Yoyo Zhou, 2013/01/04 00:39:04]

You can just delete this parenthetical. (But in the future, put a space before
an open paren and punctuate etc.)

+// that may be specified in the manifest of an extension.
+struct ManifestURL : public Extension::ManifestData {
+  GURL url_;
+
+  // Returns the DevTools Page for this extension.
+  static const GURL& GetDevToolsPage(const Extension* extension);
+
+  // Returns the Homepage URL for this extension.
+  // If homepage_url was not specified in the manifest,
+  // this returns the Google Gallery URL. For third-party extensions,
+  // this returns a blank GURL.
+  static const GURL GetHomepageURL(const Extension* extension);
+};
+
+// Parses the "devtools_page" manifest key.
+class DevToolsPageHandler : public ManifestHandler {
+ public:
+  DevToolsPageHandler();
+  virtual ~DevToolsPageHandler();
+
+  virtual bool Parse(const base::Value* value,
+                     Extension* extension,
+                     string16* error) OVERRIDE;
+};
+
+// Parses the "homepage_url" manifest key.
+class HomepageURLHandler : public ManifestHandler {
+ public:
+  HomepageURLHandler();
+  virtual ~HomepageURLHandler();
+
+  virtual bool Parse(const base::Value* value,
+                     Extension* extension,
+                     string16* error) OVERRIDE;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_MANIFEST_URL_HANDLER_H_