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..c94693add3d78e134fcc1c3e9b9c946860d1c03b 100644
--- a/chrome/browser/prefs/tracked/tracked_atomic_preference.cc
+++ b/chrome/browser/prefs/tracked/tracked_atomic_preference.cc
@@ -6,14 +6,17 @@
 
 #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,
     size_t reporting_id,
     size_t reporting_ids_count,
-    PrefHashFilter::EnforcementLevel enforcement_level)
+    PrefHashFilter::EnforcementLevel enforcement_level,
+    TrackedPreferenceValidationObserver* observer)
     : pref_path_(pref_path),
-      helper_(pref_path, reporting_id, reporting_ids_count, enforcement_level) {
+      helper_(pref_path, reporting_id, reporting_ids_count, enforcement_level),
+      observer_(observer) {
 }
 
 void TrackedAtomicPreference::OnNewValue(
@@ -34,6 +37,10 @@ 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;