Error diagnostics for Blacklist IO...

chrome/browser/privacy_blacklist/blacklist.h

 // Copyright (c) 2009 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_PRIVACY_BLACKLIST_BLACKLIST_H_
 #define CHROME_BROWSER_PRIVACY_BLACKLIST_BLACKLIST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 140 matching lines @@
   explicit Blacklist(const FilePath& path);
 
   // Destructor.
   ~Blacklist();
 
   // Returns a pointer to a Match structure holding all matching entries.
   // If no matching Entry is found, returns null. Ownership belongs to the
   // 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&);
 
   // Helper to remove cookie expiration from a header.
   static std::string StripCookieExpiry(const std::string&);
 
  private:
   // Matches a pattern to a core URL which is host/path with all the other
   // optional parts (scheme, user, password, port) stripped away. Used only
   // internally but made static so that access can be given to tests.
   static bool Matches(const std::string& pattern, const std::string& url);
 
   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);
 };
 
 #endif  // CHROME_BROWSER_PRIVACY_BLACKLIST_BLACKLIST_H_