Error diagnostics for Blacklist IO...

chrome/browser/privacy_blacklist/blacklist.h

Index: chrome/browser/privacy_blacklist/blacklist.h
===================================================================
--- chrome/browser/privacy_blacklist/blacklist.h	(revision 25875)
+++ chrome/browser/privacy_blacklist/blacklist.h	(working copy)
@@ -158,6 +158,9 @@
   // caller.
   Match* findMatch(const GURL&) const;
 
+  // Returns true if the blacklist object is in good health.
+  bool is_good() const { return is_good_; }
+
   // Helper to remove cookies from a header.
   static std::string StripCookies(const std::string&);
 
@@ -173,6 +176,8 @@
   std::vector<Entry*> blacklist_;
   std::vector<Provider*> providers_;
 
+  bool is_good_;  // True if the blacklist was read successfully.
+
   FRIEND_TEST(BlacklistTest, Generic);
   FRIEND_TEST(BlacklistTest, PatternMatch);
   DISALLOW_COPY_AND_ASSIGN(Blacklist);