Notify users about certain changes in installed extensions.

chrome/browser/extensions/extension_prefs.h

 // Copyright (c) 2011 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_EXTENSION_PREFS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 137 matching lines @@
 
   // Returns base extensions install directory.
   const FilePath& install_directory() const { return install_directory_; }
 
   // Updates the prefs based on the blacklist.
   void UpdateBlacklist(const std::set<std::string>& blacklist_set);
 
   // Based on extension id, checks prefs to see if it is blacklisted.
   bool IsExtensionBlacklisted(const std::string& id);
 
+  // Based on extension id, checks prefs to see if it is orphaned.
+  bool IsExtensionOrphaned(const std::string& id);
+
+  // Whether the user has acknowledged an external extension.
+  bool IsExternalExtensionAcknowledged(const std::string& extension_id);
+  void AcknowledgeExternalExtension(const std::string& extension_id);
+
+  // Whether the user has acknowledged a blacklisted extension.
+  bool IsBlacklistedExtensionAcknowledged(const std::string& extension_id);
+  void AcknowledgeBlacklistedExtension(const std::string& extension_id);
+
+  // Whether the user has acknowledged an orphaned extension.
+  bool IsOrphanedExtensionAcknowledged(const std::string& extension_id);
+  void AcknowledgeOrphanedExtension(const std::string& extension_id);
+
+  // Returns true if the extension notification code has already run for the
+  // first time for this profile. Currently we use this flag to mean that any
+  // extensions that would trigger notifications should get silently
+  // acknowledged. This is a fuse. Calling it the first time returns false.
+  // Subsequent calls return true. It's not possible through an API to ever
+  // reset it. Don't call it unless you mean it!
+  bool SetAlertSystemFirstRun();
+
   // Is the extension with |extension_id| allowed by policy (checking both
   // whitelist and blacklist).
   bool IsExtensionAllowedByPolicy(const std::string& extension_id);
 
   // Returns the last value set via SetLastPingDay. If there isn't such a
   // pref, the returned Time will return true for is_null().
   base::Time LastPingDay(const std::string& extension_id) const;
 
   // The time stored is based on the server's perspective of day start time, not
   // the client's.
@@ skipping 325 matching lines @@
 
   scoped_refptr<ExtensionContentSettingsStore> content_settings_store_;
 
   // The URLs of all of the toolstrips.
   URLList shelf_order_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_