[MD History] Copy stats from the old history page.

chrome/browser/resources/md_history/history_item.js

 // Copyright 2015 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.
 
 cr.define('md_history', function() {
   var HistoryItem = Polymer({
     is: 'history-item',
 
     properties: {
       // Underlying HistoryEntry data for this item. Contains read-only fields
@@ skipping 14 matching lines @@
       // True if the item is being displayed embedded in another element and
       // should not manage its own borders or size.
       embedded: {type: Boolean, reflectToAttribute: true},
 
       hasTimeGap: {type: Boolean},
 
       numberOfItems: {type: Number},
 
       // The path of this history item inside its parent.
       path: String,
+
+      index: Number,
     },
 
     /**
      * When a history-item is selected the toolbar is notified and increases
      * or decreases its count of selected items accordingly.
      * @param {MouseEvent} e
      * @private
      */
     onCheckboxSelected_: function(e) {
       // TODO(calamity): Fire this event whenever |selected| changes.
@@ skipping 18 matching lines @@
      * Remove bookmark of current item when bookmark-star is clicked.
      * @private
      */
     onRemoveBookmarkTap_: function() {
       if (!this.item.starred)
         return;
 
       if (this.$$('#bookmark-star') == this.root.activeElement)
         this.$['menu-button'].focus();
 
-      md_history.BrowserService.getInstance()
-        .removeBookmark(this.item.url);
+      var browserService = md_history.BrowserService.getInstance();
+      browserService.removeBookmark(this.item.url);
+      browserService.recordAction('BookmarkStarClicked');
+
       this.fire('remove-bookmark-stars', this.item.url);
     },
 
     /**
      * Fires a custom event when the menu button is clicked. Sends the details
      * of the history item and where the menu should appear.
      */
     onMenuButtonTap_: function(e) {
       this.fire('toggle-menu', {
         target: Polymer.dom(e).localTarget,
+        index: this.index,
         item: this.item,
         path: this.path,
       });
 
       // Stops the 'tap' event from closing the menu when it opens.
       e.stopPropagation();
     },
 
     /**
+     * Record metrics when a result is clicked. This is deliberately tied to
+   * on-click rather than on-tap, as on-click triggers from middle clicks.
+     */
+    onLinkClick_: function() {
+      var browserService = md_history.BrowserService.getInstance();
+      browserService.recordAction('EntryLinkClick');
+
+      if (this.searchTerm)
+        browserService.recordAction('SearchResultClick');
+
+      if (this.index == undefined)
+        return;
+
+      browserService.recordHistogram(
+          'HistoryPage.ClickPosition', this.index, UMA_MAX_BUCKET_VALUE);
+
+      if (this.index <= UMA_MAX_SUBSET_BUCKET_VALUE) {
+        browserService.recordHistogram(
+            'HistoryPage.ClickPositionSubset', this.index,
+            UMA_MAX_SUBSET_BUCKET_VALUE);
+      }
+    },
+
+    onLinkRightClick_: function() {
+      md_history.BrowserService.getInstance().recordAction(
+          'EntryLinkRightClick');
+    },
+
+    /**
      * Set the favicon image, based on the URL of the history item.
      * @private
      */
     showIcon_: function() {
       this.$.icon.style.backgroundImage =
           cr.icon.getFaviconImageSet(this.item.url);
     },
 
     selectionNotAllowed_: function() {
       return !loadTimeData.getBoolean('allowDeletingHistory');
@@ skipping 45 matching lines @@
 
     if (searchedTerm)
       return currentItem.dateShort != nextItem.dateShort;
 
     return currentItem.time - nextItem.time > BROWSING_GAP_TIME &&
         currentItem.dateRelativeDay == nextItem.dateRelativeDay;
   };
 
   return { HistoryItem: HistoryItem };
 });