MD History: Add routing for grouped history mode.

chrome/browser/resources/md_history/history_toolbar.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/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_lazy_render/cr_lazy_render.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_toolbar/cr_toolbar.html">
 <link rel="import" href="chrome://history/browser_service.html">
 <link rel="import" href="chrome://history/icons.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <!-- Lazy loaded: iron-dropdown, paper-button, paper-icon-button-light,
@@ skipping 206 matching lines @@
           </div>
         </div>
       </template>
     </div>
     <template is="dom-if" if="[[isGroupedMode]]">
       <div id="grouped-buttons-container">
         <paper-tabs attr-for-selected="value" selected="[[groupedRange]]"
             on-iron-select="onTabSelected_">
           <paper-tab value="0">$i18n{rangeAllTime}</paper-tab>
           <paper-tab value="1">$i18n{rangeWeek}</paper-tab>
           <paper-tab value="2">$i18n{rangeMonth}</paper-tab>

[calamity, 2017/01/27 03:47:34]

Tangent: these look terrible before the lazy load bundle comes in. We should
probably shim these.

[tsergeant, 2017/01/30 02:13:14]

Already on it: https://codereview.chromium.org/2651013004/

(hiding is easier than shimming)

         </paper-tabs>
         <div id="grouped-nav-container">
           <span id="grouped-date">
             [[getHistoryInterval_(queryInfo)]]
           </span>
           <button is="paper-icon-button-light"
               id="today-button"
               class="icon-button"
               title="$i18n{rangeToday}"
-              on-tap="onTodayTap_"
+              on-click="onTodayTap_"
               disabled="[[isToday_(groupedOffset)]]">
             <iron-icon icon="history:today"></iron-icon>
           </button>
           <button is="paper-icon-button-light"
               id="prev-button"
               title="$i18n{rangePrevious}"
               class="icon-button rtl-reversible"
-              on-tap="onPrevTap_"
+              on-click="onPrevTap_"
               disabled="[[!hasMoreResults]]">
             <iron-icon icon="history:chevron-left"></iron-icon>
           </button>
           <button is="paper-icon-button-light"
               id="next-button"
               title="$i18n{rangeNext}"
               class="icon-button rtl-reversible"
-              on-tap="onNextTap_"
+              on-click="onNextTap_"
               disabled="[[isToday_(groupedOffset)]]">
             <iron-icon icon="cr:chevron-right"></iron-icon>
           </button>
         </div>
       </div>
     </template>
   </template>
   <script src="chrome://history/history_toolbar.js"></script>
 </dom-module>