Autoclick on md-settings is synced with autoclick on settings.

chrome/browser/resources/settings/a11y_page/a11y_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <if expr="chromeos">
 <link rel="import" href="/controls/settings_checkbox.html">

[Dan Beam, 2016/07/16 00:35:27]

<link rel="import" href="/controls/settings_dropdown_menu.html">

 </if>
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="settings-a11y-page">
   <template>
     <style include="settings-shared"></style>
 <if expr="chromeos">
     <div class="settings-box row first">
       <span>
         $i18n{a11yExplanation}
@@ skipping 25 matching lines @@
       </settings-checkbox>
       <settings-checkbox label="$i18n{tapDraggingLabel}"
           pref="{{prefs.settings.touchpad.enable_tap_dragging}}">
       </settings-checkbox>
       <settings-checkbox label="$i18n{clickOnStopLabel}"
           pref="{{prefs.settings.a11y.autoclick}}">
       </settings-checkbox>
 
       <div class="list-item settings-checkbox-spacer">
         <div>$i18n{delayBeforeClickLabel}</div>
-        <select value="{{prefs.settings.a11y.autoclick_delay_ms::change}}">
-          <option value="600">$i18n{delayBeforeClickExtremelyShort}</option>
-          <option value="800">$i18n{delayBeforeClickVeryShort}</option>
-          <option value="1000">$i18n{delayBeforeClickShort}</option>
-          <option value="2000">$i18n{delayBeforeClickLong}</option>
-          <option value="4000">$i18n{delayBeforeClickVeryLong}</option>
-        </select>
+        <settings-dropdown-menu id="defaultAutoClickDelay"
+              pref="{{prefs.settings.a11y.autoclick_delay_ms}}"
+              menu-options="[[autoClickDelayOptions_]]" no-label-float>
+        </settings-dropdown-menu>
       </div>
 
       <settings-checkbox pref="{{prefs.settings.a11y.virtual_keyboard}}"
           label="$i18n{onScreenKeyboardLabel}">
       </settings-checkbox>
       <settings-checkbox pref="{{prefs.settings.a11y.mono_audio}}"
           label="$i18n{monoAudioLabel}">
       </settings-checkbox>
       <settings-checkbox pref="{{prefs.settings.a11y.caret_highlight}}"
           label="$i18n{caretHighlightLabel}">
@@ skipping 21 matching lines @@
 <if expr="not chromeos">
     <div class="settings-box first">
 </if>
       <paper-button class="primary-button" on-tap="onMoreFeaturesTap_">
         $i18n{moreFeaturesLink}
       </paper-button>
     </div>
   </template>
   <script src="a11y_page.js"></script>
 </dom-module>