Fix few minor easy unlock bugs

chrome/common/extensions/api/easy_unlock_private.idl

Index: chrome/common/extensions/api/easy_unlock_private.idl
diff --git a/chrome/common/extensions/api/easy_unlock_private.idl b/chrome/common/extensions/api/easy_unlock_private.idl
index 1648853257bfe8f14e563310b27b8da1a45a652b..fc08f9ea9a0a4316264b7258488da81de8b592b1 100644
--- a/chrome/common/extensions/api/easy_unlock_private.idl
+++ b/chrome/common/extensions/api/easy_unlock_private.idl
@@ -40,6 +40,9 @@
     // A phone eligible to unlock the device is detected, but it's not close
     // enough to be allowed to unlock the device.
     PHONE_NOT_NEARBY,
+    // A phone eligible to unlock the device is detected, but it is not allowed
+    // to unlock the device because it does not report its lock screen state.
+    PHONE_UNSUPPORTED,
     // The devie can be unlocked using Easy Unlock.
     AUTHENTICATED
   };