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

chrome/browser/resources/md_history/history_item.js

Index: chrome/browser/resources/md_history/history_item.js
diff --git a/chrome/browser/resources/md_history/history_item.js b/chrome/browser/resources/md_history/history_item.js
index b6b6603dfd28f920c4b07f74edfe8b5a1e6d983c..6a62ff7250b101e56868ab5d37f7b53d97a307cc 100644
--- a/chrome/browser/resources/md_history/history_item.js
+++ b/chrome/browser/resources/md_history/history_item.js
@@ -70,8 +70,10 @@ cr.define('md_history', function() {
       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);
     },
 
@@ -91,6 +93,31 @@ cr.define('md_history', function() {
     },
 
     /**
+     * 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');
+      browserService.recordHistogram(
+          'HistoryPage.ClickPosition', this.item.index, UMA_MAX_BUCKET_VALUE);
+
+      if (this.item.index <= UMA_MAX_SUBSET_BUCKET_VALUE) {
+        browserService.recordHistogram(
+            'HistoryPage.ClickPositionSubset', this.item.index,
+            UMA_MAX_SUBSET_BUCKET_VALUE);
+      }
+
+      if (this.searchTerm)
+        browserService.recordAction('SearchResultClick');
+    },
+
+    onLinkRightClick_: function() {
+      md_history.BrowserService.getInstance().recordAction(
+          'EntryLinkRightClick');
+    },
+
+    /**
      * Set the favicon image, based on the URL of the history item.
      * @private
      */