MD Settings: Show "Set date and time" button when relevant

chrome/browser/resources/settings/date_time_page/date_time_page.html

Index: chrome/browser/resources/settings/date_time_page/date_time_page.html
diff --git a/chrome/browser/resources/settings/date_time_page/date_time_page.html b/chrome/browser/resources/settings/date_time_page/date_time_page.html
index 92709f6541b6bd4abd26f9052ef4f7a77aff35de..524ec8bb4b9d9896084293fcb73e4008a8147ce8 100644
--- a/chrome/browser/resources/settings/date_time_page/date_time_page.html
+++ b/chrome/browser/resources/settings/date_time_page/date_time_page.html
@@ -2,6 +2,7 @@
 <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/paper-checkbox/paper-checkbox.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="/controls/settings_checkbox.html">
 <link rel="import" href="/controls/settings_dropdown_menu.html">
 <link rel="import" href="/i18n_setup.html">
@@ -19,6 +20,10 @@
       cr-policy-pref-indicator {
         -webkit-margin-start: var(--checkbox-spacing);
       }
+
+      .hidden {
+        display: none;
+      }

[stevenjb, 2016/10/26 19:36:21]

Use hidden=[[!canSetDateTime_]] instead to be consistent with everywhere else?

[michaelpg, 2016/11/02 01:54:14]

Done.

     </style>
     <div class="settings-box first">
       <settings-dropdown-menu pref="{{prefs.cros.system.timezone}}"
@@ -44,6 +49,11 @@
           label="$i18n{use24HourClock}">
       </settings-checkbox>
     </div>
+    <div class="settings-box hidden" id="setDateTime" actionable
+        on-tap="onSetDateTimeTap_">
+      <div class="start"><div>$i18n{setDateTime}</div></div>

[stevenjb, 2016/10/26 19:36:21]

nit: This is hard to read, can we put this on 3 lines instead?

[michaelpg, 2016/11/02 01:54:14]

Done.

+      <button class="subpage-arrow" is="paper-icon-button-light"></button>
+    </div>
   </template>
   <script src="/date_time_page/date_time_page.js"></script>
 </dom-module>