Add an automatic settings reset banner.

chrome/browser/prefs/pref_hash_filter.cc

Index: chrome/browser/prefs/pref_hash_filter.cc
diff --git a/chrome/browser/prefs/pref_hash_filter.cc b/chrome/browser/prefs/pref_hash_filter.cc
index 1935708f9e22ca39964f2580d8dd402d1d39d9b9..a40b28a0e6dbd3e34c372b511f924a50fce767dc 100644
--- a/chrome/browser/prefs/pref_hash_filter.cc
+++ b/chrome/browser/prefs/pref_hash_filter.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/prefs/pref_hash_filter.h"
 
+#include "base/callback.h"

[gab, 2014/02/10 04:02:21]

Don't include this; already included in header.

[robertshield, 2014/02/10 13:56:15]

Done.

 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_store.h"
@@ -17,7 +18,8 @@ PrefHashFilter::PrefHashFilter(
     const TrackedPreferenceMetadata tracked_preferences[],
     size_t tracked_preferences_size,
     size_t reporting_ids_count,
-    EnforcementLevel enforcement_level) {
+    EnforcementLevel enforcement_level,
+    const base::Closure& reset_callback) : reset_callback_(reset_callback) {
   DCHECK(pref_hash_store);
   DCHECK_GE(reporting_ids_count, tracked_preferences_size);
 
@@ -82,10 +84,16 @@ void PrefHashFilter::Initialize(PrefStore* pref_store) {
 void PrefHashFilter::FilterOnLoad(base::DictionaryValue* pref_store_contents) {
   DCHECK(pref_store_contents);
   base::TimeTicks checkpoint = base::TimeTicks::Now();
+  bool did_reset = false;
   for (TrackedPreferencesMap::const_iterator it = tracked_paths_.begin();
        it != tracked_paths_.end(); ++it) {
-    it->second->EnforceAndReport(pref_store_contents);
+    if (it->second->EnforceAndReport(pref_store_contents))
+      did_reset = true;
   }
+
+  if (did_reset)
+    reset_callback_.Run();
+
   // TODO(gab): Remove this histogram by Feb 21 2014; after sufficient timing
   // data has been gathered from the wild to be confident this doesn't
   // significantly affect startup.