[MD Bookmarks] Add search.

chrome/browser/resources/md_bookmarks/toolbar.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_action_menu/cr_action_menu.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_toolbar/cr_toolbar.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="chrome://bookmarks/shared_style.html">
 <link rel="stylesheet" href="chrome://resources/css/md_colors.css">
 
 <dom-module id="bookmarks-toolbar">
   <template>
     <style include="shared-style">
@@ skipping 27 matching lines @@
       <hr>
       <button class="dropdown-item" on-tap="onImportTap_">
         $i18n{menuImport}
       </button>
       <button class="dropdown-item" on-tap="onExportTap_">
         $i18n{menuExport}
       </button>
     </dialog>
     <cr-toolbar page-name="$i18n{title}"
         clear-label="$i18n{clearSearch}"
-        search-prompt="$i18n{searchPrompt}">
+        search-prompt="$i18n{searchPrompt}"
+        on-search-changed="onSearchChanged_">
       <button is="paper-icon-button-light" class="more-actions more-vert-button"
           on-tap="onMenuButtonOpenTap_">
         <div></div>
         <div></div>
         <div></div>
       </button>
     </cr-toolbar>
   </template>
   <script src="chrome://bookmarks/toolbar.js"></script>
 </dom-module>