Lazy-creates BluetoothAdapter in ExtensionBluetoothEventRouter (EBEE).

chrome/browser/extensions/event_router.cc

Index: chrome/browser/extensions/event_router.cc
diff --git a/chrome/browser/extensions/event_router.cc b/chrome/browser/extensions/event_router.cc
index b6683a6f4c5df142df87e9a811be43e2215f674f..a36adbcfc030b23365567657a9504d9e00076c03 100644
--- a/chrome/browser/extensions/event_router.cc
+++ b/chrome/browser/extensions/event_router.cc
@@ -186,6 +186,9 @@ void EventRouter::OnListenerAdded(const EventListener* listener) {
 
   if (SystemInfoEventRouter::IsSystemInfoEvent(event_name))
     SystemInfoEventRouter::GetInstance()->AddEventListener(event_name);
+  ExtensionService* service =
+      ExtensionSystem::Get(profile_)->extension_service();
+  service->NotifyExtensionEventRoutersOnListenerAdded(event_name);
 }
 
 void EventRouter::OnListenerRemoved(const EventListener* listener) {
@@ -214,6 +217,9 @@ void EventRouter::OnListenerRemoved(const EventListener* listener) {
 
   if (SystemInfoEventRouter::IsSystemInfoEvent(event_name))
     SystemInfoEventRouter::GetInstance()->RemoveEventListener(event_name);
+  ExtensionService* service =
+      ExtensionSystem::Get(profile_)->extension_service();
+  service->NotifyExtensionEventRoutersOnListenerRemoved(event_name);
 }
 
 void EventRouter::AddLazyEventListener(const std::string& event_name,