Wait for the battery level before starting encryption migration.

chrome/browser/resources/chromeos/login/encryption_migration.js

 // Copyright 2017 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.
 
 /**
  * @fileoverview Polymer element for displaying encryption migration screen.
  */
 
 /**
  * Enum for the UI states corresponding to sub steps inside migration screen.
@@ skipping 32 matching lines @@
       value: -1
     },
 
     /**
      * Whether the current migration is resuming the previous one.
      */
     isResuming: {
       type: Boolean,
       value: false
     },
+
+    /**
+     * Battery level.
+     */
+    batteryPercent: {
+      type: Number,
+      value: 0
+    },
+
+    /**
+     * True if the battery level is enough to start migration.
+     */
+    isEnoughBattery: {
+      type: Boolean,
+      value: true
+    },
+
+    /**
+     * True if the user already accepted the migration.
+     */
+    isMigrationAccepted: {
+      type: Boolean,
+      value: false
+    },
   },
 
   /**
    * Returns true if the migration is in initial state.
    * @param {EncryptionMigrationUIState} state Current UI state
    * @private
    */
   isInitial_: function(state) {
     return state == EncryptionMigrationUIState.INITIAL;
   },
@@ skipping 69 matching lines @@
   },
 
   /**
    * Handles tap on RESTART button.
    * @private
    */
   onRestart_: function() {
     this.fire('restart');
   },
 });