[Easy signin] Wire up userClick auth attempt to easy unlock app and back

chromeos/login/auth/user_context.h

Index: chromeos/login/auth/user_context.h
diff --git a/chromeos/login/auth/user_context.h b/chromeos/login/auth/user_context.h
index 5ba5b4567600a3e6945f14a3dbf07e106ec24f80..ff28c966eba8f2b27a0835fc4182e2723ce0d623 100644
--- a/chromeos/login/auth/user_context.h
+++ b/chromeos/login/auth/user_context.h
@@ -26,7 +26,9 @@ class CHROMEOS_EXPORT UserContext {
     // Online authentication against GAIA. GAIA redirected to a SAML IdP.
     AUTH_FLOW_GAIA_WITH_SAML,
     // Offline authentication against a cached key.
-    AUTH_FLOW_OFFLINE
+    AUTH_FLOW_OFFLINE,
+    // Offline authentication using and Easy unlock device (e.g. a phone).
+    AUTH_FLOW_EASY_UNLOCK
   };
 
   UserContext();