MD Settings: Preserve search URL param in subpages.

chrome/browser/resources/settings/settings_menu/settings_menu.html

 <link rel="import" href="chrome://resources/cr_elements/icons.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/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu/paper-menu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu/paper-submenu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-ripple/paper-ripple.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/route.html">
 <link rel="import" href="/settings_shared_css.html">
@@ skipping 83 matching lines @@
     <paper-menu name="root-menu">
       <div class="page-menu" id="basicPage">
         <paper-menu attr-for-selected="data-path" class="menu-content"
             id="basicMenu" selected="[[currentRoute.path]]">
 <if expr="chromeos">
           <div data-path="/internet" on-tap="openPage_">
             <iron-icon icon="settings:network-wifi"></iron-icon>
             $i18n{internetPageTitle}
           </div>
 </if>
-          <div data-path="/people" on-tap="openPage_"
+          <div id="people" data-path="/people" on-tap="openPage_"
               hidden="[[!pageVisibility.people]]">
             <iron-icon icon="settings:people"></iron-icon>
             $i18n{peoplePageTitle}
           </div>
           <div data-path="/appearance" on-tap="openPage_"
               hidden="[[!pageVisibility.appearance]]">
             <iron-icon icon="settings:palette"></iron-icon>
             $i18n{appearancePageTitle}
           </div>
 <if expr="chromeos">
@@ skipping 84 matching lines @@
       <paper-submenu class="page-menu">
         <div about-selected$="[[aboutSelected_]]" class="menu-trigger"
             id="about-menu" on-tap="openPage_" data-path="/help">
           $i18n{aboutPageTitle}
         </div>
       </paper-submenu>
     </paper-menu>
   </template>
   <script src="settings_menu.js"></script>
 </dom-module>