[Smart Lock] Add error message strings for the "Tx Power too high" case.

chrome/browser/chromeos/login/easy_unlock/easy_unlock_metrics.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_EASY_UNLOCK_METRICS_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_EASY_UNLOCK_METRICS_H_
 
 namespace chromeos {
 
 // Tracking login events for Easy unlock metrics.
@@ skipping 40 matching lines @@
   PASSWORD_SIGN_IN_TX_POWER_TOO_HIGH = 15,
   // Password is used for sign-in because Easy sign-in failed.
   PASSWORD_SIGN_IN_LOGIN_FAILED = 16,
   // Password is used for sign-in because pairing data is changed for a "new"
   // Chromebook (where there was no previous pairing data)..
   PASSWORD_SIGN_IN_PAIRING_ADDED = 17,
   // Password is used for sign-in because there is no screenlock state handler.
   // Most likely because EasyUnlock is disabled, e.g. Bluetooth adapter not
   // ready.
   PASSWORD_SIGN_IN_NO_SCREENLOCK_STATE_HANDLER = 18,
+  // Password is used for sign-in because the phone is (a) locked, and (b) not
+  // right next to the Chromebook.
+  PASSWORD_SIGN_IN_PHONE_LOCKED_AND_TX_POWER_TOO_HIGH = 19,
 
   EASY_SIGN_IN_LOGIN_EVENT_COUNT  // Must be the last.
 };
 
 void RecordEasyUnlockLoginEvent(EasyUnlockLoginEvent event);
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_EASY_UNLOCK_METRICS_H_