[MD Bookmarks] Add Select for Bookmarks.

chrome/test/data/webui/md_bookmarks/test_util.js

Index: chrome/test/data/webui/md_bookmarks/test_util.js
diff --git a/chrome/test/data/webui/md_bookmarks/test_util.js b/chrome/test/data/webui/md_bookmarks/test_util.js
index 64755a2f3ce1fea25e9bf214a2f6f3a405a74ad3..90fa5e440b88a2a3f11442c19a66a56cff10adf4 100644
--- a/chrome/test/data/webui/md_bookmarks/test_util.js
+++ b/chrome/test/data/webui/md_bookmarks/test_util.js
@@ -69,3 +69,27 @@ function createItem(id, config) {
   }
   return newItem;
 }
+
+/**
+ * Sends a custom click event to |element|.
+ * @param {HTMLElement} element
+ * @param {Object=} config
+ */
+function customClick(element, config) {
+  var props = {
+    bubbles: true,
+    cancelable: true,
+    buttons: 1,
+    shiftKey: false,
+    ctrlKey: false,
+  };
+
+  if (config) {
+    for (var key in config)
+      props[key] = config[key];
+  }
+
+  element.dispatchEvent(new MouseEvent('mousedown', props));
+  element.dispatchEvent(new MouseEvent('mouseup', props));
+  element.dispatchEvent(new MouseEvent('click', props));
+}