[MD History] Implement grouped history UI.

chrome/browser/resources/md_history/history_toolbar.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/hardware-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-tabs/paper-tab.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-tabs/paper-tabs.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_search_field/cr_search_field.html">
@@ skipping 118 matching lines @@
       #grouped-nav-container {
         @apply(--layout-center);
         @apply(--layout-end-justified);
         @apply(--layout-flex);
         @apply(--layout-horizontal);
         -webkit-margin-end: 24px;
         overflow: hidden;
         transition: opacity 150ms;
       }
 
-      :host([grouped-range=0]) #grouped-nav-container {
+      :host([grouped-range="0"]) #grouped-nav-container {
         opacity: 0;
         pointer-events: none;
       }
 
       #grouped-date {
         flex: 0 1 auto;
         opacity: 0.7;
         overflow: hidden;
         text-align: right;
         text-overflow: ellipsis;
@@ skipping 53 matching lines @@
               class="rtl-reversible"></paper-icon-button>
           <paper-icon-button icon="hardware:keyboard-arrow-right"
               alt="$i18n{rangeNext}" title="$i18n{rangeNext}"
               class="rtl-reversible"></paper-icon-button>
         </div>
       </div>
     </template>
   </template>
   <script src="chrome://history/history_toolbar.js"></script>
 </dom-module>