chromeos: Add settings to control power management prefs.

chrome/browser/resources/settings/device_page/power.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 
+<link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_indicator.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/md_select_css.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="settings-power">
   <template>
     <style include="settings-shared md-select"></style>
@@ skipping 15 matching lines @@
               [[item.description]]
             </option>
           </template>
         </select>
         <span class="md-select-underline"></span>
       </div>
       <div hidden$="[[showPowerSourceDropdown_]]">
         [[powerSourceName_]]
       </div>
     </div>
+
+    <div class="settings-box">
+      <div class="start">$i18n{powerIdleLabel}</div>
+      <template is="dom-if" if="[[idleManaged_]]" restamp>
+        <cr-policy-indicator id="idleManagedIndicator"

[michaelpg, 2017/06/16 01:35:00]

Ask hcarmona@ what the correct aria use is here:
  * set icon-aria-label with the same "powerIdleLabel" that describes the
<select>? (code search shows this is popular)
  * do nothing and ignore the AX errors? (settings-dropdown-menu itself does
nothing here)
  * something else?

[Daniel Erat, 2017/06/16 02:34:24]

i noticed this pattern too (and think i had this in an earlier version of the
change), but it doesn't make much sense to me. i would've expected this to
describe the icon, not to be yet another duplicated copy of the main select
label.

+            indicator-type="devicePolicy">
+        </cr-policy-indicator>
+      </template>
+      <div class="md-select-wrapper">
+        <select id="idleSelect" class="md-select"
+            on-change="onIdleSelectChange_" aria-label="$i18n{powerIdleLabel}"
+            disabled="[[idleManaged_]]">
+          <template is="dom-repeat" items="[[idleOptions_]]">
+            <option value="[[item.value]]">[[item.name]]</option>
+          </template>
+        </select>
+        <span class="md-select-underline"></span>
+      </div>
+    </div>
+
+    <div class="settings-box continuation" hidden$="[[!hasLid_]]">
+      <div class="start">$i18n{powerLidClosedLabel}</div>
+      <template is="dom-if" if="[[lidClosedManaged_]]" restamp>
+        <cr-policy-indicator id="lidClosedManagedIndicator"

[michaelpg, 2017/06/16 01:35:00]

(ditto)

[Daniel Erat, 2017/06/16 02:34:24]

Acknowledged.

+            indicator-type="devicePolicy">
+        </cr-policy-indicator>
+      </template>
+      <div class="md-select-wrapper">
+        <select id="lidClosedSelect" class="md-select"
+            on-change="onLidClosedSelectChange_"
+            aria-label="$i18n{powerLidClosedLabel}"
+            disabled="[[lidClosedManaged_]]">
+          <template is="dom-repeat" items="[[lidClosedOptions_]]">
+            <option value="[[item.value]]">[[item.name]]</option>
+          </template>
+        </select>
+        <span class="md-select-underline"></span>
+      </div>
+    </div>
   </template>
   <script src="power.js"></script>
 </dom-module>