[MD History] Add UMA stats for switching views and the CBD button.

chrome/browser/resources/md_history/side_bar.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 Polymer({
   is: 'history-side-bar',
 
   properties: {
-    selectedPage: {
-      type: String,
-      notify: true
-    },
+    selectedPage: {type: String, notify: true},
 
     route: Object,
 
     showFooter: Boolean,
 
     // If true, the sidebar is contained within an app-drawer.
-    drawer: {
-      type: Boolean,
-      reflectToAttribute: true
-    },
-  },
-
-  /** @private */
-  onSelectorActivate_: function() {
-    this.fire('history-close-drawer');
+    drawer: {type: Boolean, reflectToAttribute: true},
   },
 
   /**
+   * @private
+   */
+  onSelectorActivate_: function() { this.fire('history-close-drawer'); },
+
+  /**
    * Relocates the user to the clear browsing data section of the settings page.
    * @param {Event} e
    * @private
    */
   onClearBrowsingDataTap_: function(e) {
+    md_history.BrowserService.getInstance().recordAction(
+        'HistoryPage_InitClearBrowsingData');
     md_history.BrowserService.getInstance().openClearBrowsingData();
     e.preventDefault();
   },
 
   /**
    * @param {Object} route
    * @private
    */
-  getQueryString_: function(route) {
-    return window.location.search;
-  }
+  getQueryString_: function(route) { return window.location.search; }
 });