Add a very basic PIN UI implementation that is shared between lock and settings.

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

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-checkbox/paper-checkbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-dialog/paper-dialog.html">
 <link rel="import" href="chrome://md-settings/controls/settings_checkbox.html">
 <link rel="import" href="chrome://md-settings/i18n_setup.html">
 <link rel="import" href="chrome://md-settings/people_page/sync_page.html">
 <link rel="import" href="chrome://md-settings/people_page/profile_info_browser_proxy.html">
 <link rel="import" href="chrome://md-settings/people_page/sync_browser_proxy.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_animated_pages.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_subpage.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 
 <if expr="chromeos">
 <link rel="import" href="chrome://md-settings/people_page/change_picture.html">
+<link rel="import" href="chrome://md-settings/people_page/pin_keyboard.html">
 <link rel="import" href="chrome://md-settings/people_page/easy_unlock_browser_proxy.html">
 <link rel="import" href="chrome://md-settings/people_page/easy_unlock_turn_off_dialog.html">
 <link rel="import" href="chrome://md-settings/people_page/users_page.html">
 </if>
 <if expr="not chromeos">
 <link rel="import" href="chrome://md-settings/people_page/manage_profile.html">
 </if>
 
 <dom-module id="settings-people-page">
   <template>
@@ skipping 81 matching lines @@
             if="[[isAdvancedSyncSettingsVisible_(syncStatus)]]">
           <div class="settings-box">
             <paper-button on-tap="onSyncTap_" class="primary-button">
               $i18n{syncPageTitle}
             </paper-button>
           </div>
         </template>
 
         <div class="settings-box" id="activity-controls"
             on-tap="onActivityControlsTap_">
           <div id="googleg-logo-container">

[tommycli, 2016/05/06 23:54:18]

Can you use a plain img tag and position using flex item css rules?

[jdufault, 2016/05/10 18:45:23]

Sorry, this is a rebase change. I accidentally forgot to separate the rebase
patch.

             <div id="googleg-logo"></div>
           </div>
           <div class="middle">
             <div>$i18n{personalizeGoogleServicesTitle}</div>
             <div class="secondary">$i18n{personalizeGoogleServicesText}</div>
           </div>
         </div>
 
 <if expr="chromeos">
+        <!-- TODO(jdufault): Confirm if this goes above or below easy unlock
+             settings. -->
+        <template is="dom-if" if=[[pinUnlockAllowed_]]>
+          <div class="settings-box">
+            <!-- TODO(jdufault): i18n -->
+            <p>Quick Unlock PIN</p>
+            <pin-keyboard></pin-keyboard>
+          </div>
+        </template>
+
         <div class="settings-box">
           <settings-checkbox pref="{{prefs.settings.enable_screen_lock}}"
               i18n-values="label:enableScreenlock">
           </settings-checkbox>
         </div>
 
         <template is="dom-if" if="[[easyUnlockAllowed_]]">
           <div class="settings-box">
             <div class="middle">
               <div>$i18n{easyUnlockSectionTitle}</div>
@@ skipping 90 matching lines @@
 
 <if expr="chromeos">
     <template is="dom-if" if="[[easyUnlockEnabled_]]">
       <easy-unlock-turn-off-dialog id="easyUnlockTurnOffDialog">
       </easy-unlock-turn-off-dialog>
     </template>
 </if>
   </template>
   <script src="people_page.js"></script>
 </dom-module>