Indicate in the tab UI if appcache creation was blocked by privacy settings.

webkit/appcache/appcache_group.h

Index: webkit/appcache/appcache_group.h
diff --git a/webkit/appcache/appcache_group.h b/webkit/appcache/appcache_group.h
index c1bb1fcf651424be14b6ce616b0582943da8b945..a8113374e5aa659314374a6ef5ac432ce1c73cfc 100644
--- a/webkit/appcache/appcache_group.h
+++ b/webkit/appcache/appcache_group.h
@@ -30,9 +30,12 @@ class AppCacheGroup : public base::RefCounted<AppCacheGroup> {
 
   class UpdateObserver {
     public:
+      // Called if access to the appcache was blocked by a policy.
+      virtual void OnContentBlocked(AppCacheGroup* group) = 0;
+
       // Called just after an appcache update has completed.
       virtual void OnUpdateComplete(AppCacheGroup* group) = 0;
-      virtual ~UpdateObserver() { }
+      virtual ~UpdateObserver() {}
   };
 
   enum UpdateStatus {
@@ -105,6 +108,8 @@ class AppCacheGroup : public base::RefCounted<AppCacheGroup> {
   AppCacheUpdateJob* update_job() { return update_job_; }
   void SetUpdateStatus(UpdateStatus status);
 
+  void NotifyContentBlocked();
+
   const Caches& old_caches() const { return old_caches_; }
 
   // Update cannot be processed at this time. Queue it for a later run.