Allow extensions to specify that they are not allowed in incognito mode.

extensions/browser/extension_util.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_EXTENSION_UTIL_H_
 #define EXTENSIONS_BROWSER_EXTENSION_UTIL_H_
 
 #include <string>
 
 class GURL;
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
-
+class Extension;
 struct ExtensionInfo;
 
 namespace util {
 
 // TODO(tmdiep): Move functions from
 // chrome/browser/extensions/extension_util.h/cc that are only dependent on
 // extensions/ here.
 
 // Returns true if |extension_id| identifies an extension that is installed
 // permanently and not ephemerally.
 bool IsExtensionInstalledPermanently(const std::string& extension_id,
                                      content::BrowserContext* context);
 
 // Returns true if |extension_id| identifies an ephemeral app.
 bool IsEphemeralApp(const std::string& extension_id,
                     content::BrowserContext* context);
 
 // Returns true if the extension has isolated storage.
 bool HasIsolatedStorage(const ExtensionInfo& info);
 
 // Returns true if the site URL corresponds to an extension or app and has
 // isolated storage.
 bool SiteHasIsolatedStorage(const GURL& extension_site_url,
                             content::BrowserContext* context);
 
+// Returns true if the extension can be enabled in incognito mode.
+bool CanBeIncognitoEnabled(const Extension* extension);
+
 }  // namespace util
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_UTIL_H_