Make Blacklist::IsBlacklist asynchronous (it will need to be for safe

chrome/browser/extensions/blacklist.h

Index: chrome/browser/extensions/blacklist.h
diff --git a/chrome/browser/extensions/blacklist.h b/chrome/browser/extensions/blacklist.h
index 58b12dbab31fdf098a4e48d76b81e9f40ef6a079..89705a5e7ea4822407590df53fc689541bf17c44 100644
--- a/chrome/browser/extensions/blacklist.h
+++ b/chrome/browser/extensions/blacklist.h
@@ -5,9 +5,11 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_BLACKLIST_H_
 #define CHROME_BROWSER_EXTENSIONS_BLACKLIST_H_
 
+#include <set>
 #include <string>
 #include <vector>
 
+#include "base/callback.h"
 #include "base/observer_list.h"
 
 namespace extensions {
@@ -32,18 +34,19 @@ class Blacklist {
     Blacklist* blacklist_;
   };
 
+  typedef base::Callback<void(const std::set<std::string>&)>
+      GetBlacklistedIDsCallback;
+
   // |prefs_| must outlive this.
   explicit Blacklist(ExtensionPrefs* prefs);
 
   ~Blacklist();
 
-  // Gets whether an extension is blacklisted.
-  //
-  // Note that this doesn't entirely determine whether an extension is allowed
-  // to be loaded; there are other considerations (e.g. admin settings).
-  // See extensions::ManagementPolicy (in particular UserMayLoad).
-  bool IsBlacklisted(const std::string& extension_id) const;
-  bool IsBlacklisted(const Extension* extension) const;
+  // From the set of extension IDs passed in via |ids|, asynchronously checks
+  // which are blacklisted and includes them in the resulting set passed
+  // via |callback|, which will be sent on the caller's message loop.
+  void GetBlacklistedIDs(const std::set<std::string>& ids,
+                         const GetBlacklistedIDsCallback& callback);
 
   // Sets the blacklist from the updater to contain the extension IDs in |ids|
   void SetFromUpdater(const std::vector<std::string>& ids,
@@ -58,6 +61,8 @@ class Blacklist {
 
   ExtensionPrefs* const prefs_;
 
+  std::set<std::string> prefs_blacklist_;
+
   DISALLOW_COPY_AND_ASSIGN(Blacklist);
 };