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 19358599082197068e2d0980d61036990b53080b..17b9375188bb716304e199a8c1b6c0786001598f 100644
--- a/chrome/browser/extensions/event_router.cc
+++ b/chrome/browser/extensions/event_router.cc
@@ -198,6 +198,9 @@ 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) {
@@ -225,6 +228,9 @@ 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,