Add TrackedPreferenceValidationDelegate

chrome/browser/prefs/pref_hash_filter.h

Index: chrome/browser/prefs/pref_hash_filter.h
diff --git a/chrome/browser/prefs/pref_hash_filter.h b/chrome/browser/prefs/pref_hash_filter.h
index 7cb08313d0615faf26bb9bccdc124412af3fdcb0..1ea0da769fb504b62601e57e248519a4ef65e8eb 100644
--- a/chrome/browser/prefs/pref_hash_filter.h
+++ b/chrome/browser/prefs/pref_hash_filter.h
@@ -21,6 +21,7 @@
 class PersistentPrefStore;
 class PrefService;
 class PrefStore;
+class TrackedPreferenceValidationObserver;
 
 namespace base {
 class DictionaryValue;
@@ -59,12 +60,14 @@ class PrefHashFilter : public PrefFilter {
   };
 
   // Constructs a PrefHashFilter tracking the specified |tracked_preferences|
-  // using |pref_hash_store| to check/store hashes.
+  // using |pref_hash_store| to check/store hashes. |observer| is notified of
+  // the status of each preference as it is checked.
   // |reporting_ids_count| is the count of all possible IDs (possibly greater
   // than |tracked_preferences.size()|).
   PrefHashFilter(
       scoped_ptr<PrefHashStore> pref_hash_store,
       const std::vector<TrackedPreferenceMetadata>& tracked_preferences,
+      scoped_ptr<TrackedPreferenceValidationObserver> observer,
       size_t reporting_ids_count);
 
   virtual ~PrefHashFilter();
@@ -111,6 +114,8 @@ class PrefHashFilter : public PrefFilter {
 
   scoped_ptr<PrefHashStore> pref_hash_store_;
 
+  scoped_ptr<TrackedPreferenceValidationObserver> observer_;
+
   TrackedPreferencesMap tracked_paths_;
 
   // The set of all paths whose value has changed since the last call to