Enable/disable extensions upon changes in blacklist.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index a388b98a7bfc8fcdc128d159be897f381503e628..19aebc80f9330c350a6e9324a84932a545f4853e 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -633,6 +633,9 @@ class ExtensionService
   };
   typedef std::map<std::string, ExtensionRuntimeData> ExtensionRuntimeDataMap;
 
+  // Populates greylist_.
+  void LoadGreylistFromPrefs();
+
   // Signals *ready_ and sends a notification to the listeners.
   void SetReadyAndNotifyListeners();
 
@@ -700,7 +703,16 @@ class ExtensionService
 
   // Manages the blacklisted extensions, intended as callback from
   // Blacklist::GetBlacklistedIDs.
-  void ManageBlacklist(const std::set<std::string>& blacklisted_ids);
+  void ManageBlacklist(
+      const extensions::Blacklist::BlacklistStateMap& blacklisted_ids);
+
+  // Add extensions in |malware| to blacklisted_extensions, remove extensions

[not at google - send to devlin, 2014/01/22 00:33:14]

s/malware/blocked? or s/blocked/malware?

[Oleg Eterevsky, 2014/01/22 21:25:04]

Done.

+  // that are neither in |malware|, nor in |unknown|.
+  void UpdateBlockedExtensions(const std::set<std::string>& blocked,
+                               const std::set<std::string>& unknown);
+
+  void UpdateGreylistedExtensions(const std::set<std::string>& greylist,
+                                  const std::set<std::string>& unknown);
 
   // Controls if installs are delayed. See comment for
   // |installs_delayed_for_gc_|.
@@ -733,6 +745,14 @@ class ExtensionService
   // Sets of enabled/disabled/terminated/blacklisted extensions. Not owned.
   extensions::ExtensionRegistry* registry_;
 
+  // Set of greylisted extensions. These extensions are disabled if they are
+  // already installed in Chromium at the time when they are added to
+  // the greylist. Unlike blacklisted extensions, greylisted ones are visible
+  // to the user and if user re-enables such an extension, they remain enabled.
+  //
+  // These extensions should appear in registry_.
+  extensions::ExtensionSet greylist_;
+
   // The list of extension installs delayed for various reasons.  The reason
   // for delayed install is stored in ExtensionPrefs. These are not part of
   // ExtensionRegistry because they are not yet installed.