md settings: Give focus to password prompt on tap.

chrome/browser/resources/settings/people_page/lock_screen.html

 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/cr/ui/focus_without_ink.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-group/paper-radio-group.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="easy_unlock_browser_proxy.html">
 <link rel="import" href="easy_unlock_turn_off_dialog.html">
@@ skipping 153 matching lines @@
           </template>
         </div>
       </template>
 
       <settings-password-prompt-dialog id="passwordPrompt"
           on-close="onPasswordClosed_" set-modes="{{setModes_}}">
       </settings-password-prompt-dialog>
 
       <settings-setup-pin-dialog id="setupPin" on-done="onPinSetupDone_"
           on-close="onSetupPinClosed_" set-modes="[[setModes_]]">
       </settings-setup-pin-dialog>

[sammiequon, 2017/05/16 22:27:38]

On a separate note/CL should these dialogs be wrapped in dom-if like the easy
unlock one (and some others I came across while debugging).

[stevenjb, 2017/05/16 22:51:09]

Yep

[sammiequon, 2017/05/16 23:07:28]

Got it. Filed a bug.

 
-      <template is="dom-if" if="[[showEasyUnlockTurnOffDialog_]]">
+      <template is="dom-if" if="[[showEasyUnlockTurnOffDialog_]]" restamp>
         <easy-unlock-turn-off-dialog id="easyUnlockTurnOffDialog"
             on-close="onEasyUnlockTurnOffDialogClose_">
         </easy-unlock-turn-off-dialog>
       </template>
     </div>
   </template>
 
   <script src="lock_screen.js"></script>
 </dom-module>