Add TrackedPreferenceValidationDelegate

chrome/browser/prefs/tracked/tracked_atomic_preference.cc

Index: chrome/browser/prefs/tracked/tracked_atomic_preference.cc
diff --git a/chrome/browser/prefs/tracked/tracked_atomic_preference.cc b/chrome/browser/prefs/tracked/tracked_atomic_preference.cc
index 723734019dda3a15a8f9941a369fcad4f983db30..ce67c9536e386528b779ee62e96c5ba9432d4a85 100644
--- a/chrome/browser/prefs/tracked/tracked_atomic_preference.cc
+++ b/chrome/browser/prefs/tracked/tracked_atomic_preference.cc
@@ -6,6 +6,7 @@
 
 #include "base/values.h"
 #include "chrome/browser/prefs/pref_hash_store_transaction.h"
+#include "chrome/browser/prefs/tracked/tracked_preference_validation_observer.h"
 
 TrackedAtomicPreference::TrackedAtomicPreference(
     const std::string& pref_path,
@@ -24,7 +25,8 @@ void TrackedAtomicPreference::OnNewValue(
 
 bool TrackedAtomicPreference::EnforceAndReport(
     base::DictionaryValue* pref_store_contents,
-    PrefHashStoreTransaction* transaction) const {
+    PrefHashStoreTransaction* transaction,
+    TrackedPreferenceValidationObserver* observer) const {
   const base::Value* value = NULL;
   pref_store_contents->Get(pref_path_, &value);
   PrefHashStoreTransaction::ValueState value_state =
@@ -34,6 +36,10 @@ bool TrackedAtomicPreference::EnforceAndReport(
 
   TrackedPreferenceHelper::ResetAction reset_action =
       helper_.GetAction(value_state);
+  if (observer) {
+    observer->OnAtomicPreferenceValidation(
+        pref_path_, value, value_state, reset_action);
+  }
   helper_.ReportAction(reset_action);
 
   bool was_reset = false;