Implements the feature notification for Quick Unlock

chrome/browser/chromeos/login/lock/screen_locker.h

Index: chrome/browser/chromeos/login/lock/screen_locker.h
diff --git a/chrome/browser/chromeos/login/lock/screen_locker.h b/chrome/browser/chromeos/login/lock/screen_locker.h
index 856162047e922dc4e36fb28e303bbc31459e5e23..35342889eab718586f41f85effbe298357d782d2 100644
--- a/chrome/browser/chromeos/login/lock/screen_locker.h
+++ b/chrome/browser/chromeos/login/lock/screen_locker.h
@@ -16,6 +16,7 @@
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/lock/screen_locker_delegate.h"
+#include "chrome/browser/chromeos/login/quick_unlock/feature_notification_controller.h"
 #include "chrome/browser/chromeos/login/ui/login_display.h"
 #include "chromeos/login/auth/auth_status_consumer.h"
 #include "chromeos/login/auth/user_context.h"
@@ -194,6 +195,10 @@ class ScreenLocker : public AuthStatusConsumer {
 
   scoped_refptr<input_method::InputMethodManager::State> saved_ime_state_;
 
+  // Quick Unlock Feature Notification controller.
+  scoped_refptr<quickunlock::FeatureNotificationController>

[jdufault, 2016/07/07 22:08:01]

The screen locker shouldn't own an instance of the controller (especially since
the controller is only allocated when the screen locker is about to be
destroyed). When the controller is allocated the Notification instance should be
the only owner.

Please add a note that the controller is owned by the Notification.

[malaykeshav, 2016/07/07 22:39:43]

Done

+      qu_feature_notification_controller_;
+
   base::WeakPtrFactory<ScreenLocker> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenLocker);