MD Settings: add <controlled-button>#endJustified to flip controlled by indicator position

chrome/browser/resources/settings/controls/controlled_button.html

 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_behavior.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html">
 <link rel="import" href="/controls/pref_control_behavior.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="controlled-button">
   <template>
     <style include="settings-shared">
       :host {
         align-items: center;
         display: flex;
+        --justify-margin: 18px;
       }
 
       :host([controlled_]) {
         /* Disable pointer events for this whole element, as outer on-tap gets
          * triggered when clicking/tapping anywhere in :host. */
         pointer-events: none;
       }
 
       cr-policy-pref-indicator {
-        -webkit-margin-start: var(--checkbox-spacing);
         /* Enable pointer events for the indicator so :hover works. Disable
          * clicks/taps via onIndicatorTap_ so outer on-tap doesn't trigger. */
         pointer-events: all;
       }
+
+      :host(:not([end-justified])) cr-policy-pref-indicator {
+        -webkit-margin-start: var(--justify-margin);
+      }
+
+      :host([end-justified]) cr-policy-pref-indicator {
+        -webkit-margin-end: var(--justify-margin);
+        order: -1;

[dschuyler, 2017/01/07 02:12:20]

I'm not familiar with order: -1 to be sure it's correct.

[Dan Beam, 2017/01/07 02:14:18]

trust me, it's magical

+      }
     </style>
 
     <paper-button disabled="[[controlled_]]">
       <content></content>
     </paper-button>
 
     <template is="dom-if" if="[[controlled_]]">
       <cr-policy-pref-indicator pref="[[pref]]" on-tap="onIndicatorTap_">
       </cr-policy-pref-indicator>
     </template>
 
   </template>
   <script src="/controls/controlled_button.js"></script>
 </dom-module>