Add "sidebar" section to extension manifest:...

chrome/common/extensions/extension_sidebar_utils.h

+// Copyright (c) 2010 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_EXTENSION_SIDEBAR_UTILS_H_
+#define CHROME_COMMON_EXTENSIONS_EXTENSION_SIDEBAR_UTILS_H_
+#pragma once
+
+#include <string>
+
+class Extension;
+class GURL;
+
+namespace extension_sidebar_utils {
+
+// Returns id of an extension owning a sidebar identified by |content_id|.
+std::string GetExtensionIdByContentId(const std::string& content_id);

[Aaron Boodman, 2011/01/20 00:36:11]

Can you catch me up to date on what 'content id' is meant to be? Is this for in
the future, when multiple panels can be displayed in a sidebar?

[Aleksey Shlyapnikov, 2011/01/20 02:41:43]

The initial idea was to let one extension open more than one sidebar and
content_id was essentially a way for extension to identify a particular sidebar.
This idea did not make into sidebar v1, but I kept the concept and the name
around to keep the code generic.

On 2011/01/20 00:36:11, Aaron Boodman wrote:

+
+// Resolves |url_string| relative to |extension|'s url and verifies it
+// against |extension|'s host permissions.
+// In case of any problem, returns an empty invalid GURL and |error| receives
+// the corresponding error message.
+GURL ResolveAndVerifyUrl(const std::string& url_string,
+                         const Extension* extension,
+                         std::string* error);
+
+}  // namespace extension_sidebar_utils
+
+#endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_SIDEBAR_UTILS_H_