diff --git a/chrome/browser/ui/webui/invalidations_message_handler.cc b/chrome/browser/ui/webui/invalidations_message_handler.cc
index b05bcaf08cc80e..7b21427b89f730 100644
--- a/chrome/browser/ui/webui/invalidations_message_handler.cc
+++ b/chrome/browser/ui/webui/invalidations_message_handler.cc
@@ -25,6 +25,21 @@ namespace syncer {
 class ObjectIdInvalidationMap;
 }  // namespace syncer
 
+namespace {
+
+invalidation::ProfileInvalidationProvider* GetInvalidationProvider(
+    Profile* profile) {
+  if (base::FeatureList::IsEnabled(invalidation::switches::kFCMInvalidations)) {
+    return invalidation::ProfileInvalidationProviderFactory::GetForProfile(
+        profile);
+  } else {
+    return invalidation::DeprecatedProfileInvalidationProviderFactory::
+        GetForProfile(profile);
+  }
+}
+
+}  // namespace
+
 InvalidationsMessageHandler::InvalidationsMessageHandler()
     : logger_(NULL), weak_ptr_factory_(this) {}
 
@@ -45,16 +60,8 @@ void InvalidationsMessageHandler::RegisterMessages() {
 }
 
 void InvalidationsMessageHandler::UIReady(const base::ListValue* args) {
-  invalidation::ProfileInvalidationProvider* invalidation_provider;
-  Profile* profile = Profile::FromWebUI(web_ui());
-  if (base::FeatureList::IsEnabled(invalidation::switches::kFCMInvalidations)) {
-    invalidation_provider =
-        invalidation::ProfileInvalidationProviderFactory::GetForProfile(
-            profile);
-  } else {
-    invalidation_provider = invalidation::
-        DeprecatedProfileInvalidationProviderFactory::GetForProfile(profile);
-  }
+  invalidation::ProfileInvalidationProvider* invalidation_provider =
+      GetInvalidationProvider(Profile::FromWebUI(web_ui()));
   if (invalidation_provider) {
     logger_ = invalidation_provider->GetInvalidationService()->
         GetInvalidationLogger();
@@ -67,8 +74,7 @@ void InvalidationsMessageHandler::UIReady(const base::ListValue* args) {
 void InvalidationsMessageHandler::HandleRequestDetailedStatus(
     const base::ListValue* args) {
   invalidation::ProfileInvalidationProvider* invalidation_provider =
-      invalidation::DeprecatedProfileInvalidationProviderFactory::GetForProfile(
-          Profile::FromWebUI(web_ui()));
+      GetInvalidationProvider(Profile::FromWebUI(web_ui()));
   if (invalidation_provider) {
     invalidation_provider->GetInvalidationService()->RequestDetailedStatus(
         base::Bind(&InvalidationsMessageHandler::OnDetailedStatus,
diff --git a/components/invalidation/impl/fcm_invalidation_listener.cc b/components/invalidation/impl/fcm_invalidation_listener.cc
index be1cafe34c9cfd..ec97cb8ecad061 100644
--- a/components/invalidation/impl/fcm_invalidation_listener.cc
+++ b/components/invalidation/impl/fcm_invalidation_listener.cc
@@ -167,6 +167,11 @@ void FCMInvalidationListener::DoRegistrationUpdate() {
       object_id_invalidation_map));
 }
 
+void FCMInvalidationListener::RequestDetailedStatus(
+    base::Callback<void(const base::DictionaryValue&)> callback) const {
+  callback.Run(*CollectDebugData());
+}
+
 void FCMInvalidationListener::StopForTest() {
   Stop();
 }
@@ -231,4 +236,20 @@ void FCMInvalidationListener::OnSubscriptionChannelStateChanged(
   EmitStateChange();
 }
 
+std::unique_ptr<base::DictionaryValue>
+FCMInvalidationListener::CollectDebugData() const {
+  std::unique_ptr<base::DictionaryValue> return_value(
+      new base::DictionaryValue());
+  // For each topic record if the subscription was successful.
+  TopicSet active_topics =
+      per_user_topic_registration_manager_->GetRegisteredIds();
+  for (const Topic& topic : registered_topics_) {
+    std::string status = "Registered";
+    if (active_topics.count(topic) == 0)
+      status = "Unregistered";
+    return_value->SetString(topic, status);
+  }
+  return return_value;
+}
+
 }  // namespace syncer
diff --git a/components/invalidation/impl/fcm_invalidation_listener.h b/components/invalidation/impl/fcm_invalidation_listener.h
index 4bc1b6b9606904..66e57e990659c8 100644
--- a/components/invalidation/impl/fcm_invalidation_listener.h
+++ b/components/invalidation/impl/fcm_invalidation_listener.h
@@ -91,6 +91,9 @@ class FCMInvalidationListener : public InvalidationListener,
 
   void DoRegistrationUpdate();
 
+  void RequestDetailedStatus(
+      base::Callback<void(const base::DictionaryValue&)> callback) const;
+
   void StopForTest();
 
   TopicSet GetRegisteredIdsForTest() const;
diff --git a/components/invalidation/impl/fcm_invalidator.cc b/components/invalidation/impl/fcm_invalidator.cc
index 8a646fb160b238..3c0f7e4936d411 100644
--- a/components/invalidation/impl/fcm_invalidator.cc
+++ b/components/invalidation/impl/fcm_invalidator.cc
@@ -69,7 +69,9 @@ void FCMInvalidator::OnInvalidate(
 
 void FCMInvalidator::RequestDetailedStatus(
     base::RepeatingCallback<void(const base::DictionaryValue&)> callback)
-    const {}
+    const {
+  invalidation_listener_.RequestDetailedStatus(callback);
+}
 
 void FCMInvalidator::OnInvalidatorStateChange(InvalidatorState state) {
   registrar_.UpdateInvalidatorState(state);