[MD Bookmarks] Modify search to retain the previously selected folder.

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

Index: chrome/test/data/webui/md_bookmarks/sidebar_test.js
diff --git a/chrome/test/data/webui/md_bookmarks/sidebar_test.js b/chrome/test/data/webui/md_bookmarks/sidebar_test.js
index 6cb1212bbcad7ac6c593c5f1db23f7bb0fd15474..df909581585f594e7e30463f4d35fea9753f010f 100644
--- a/chrome/test/data/webui/md_bookmarks/sidebar_test.js
+++ b/chrome/test/data/webui/md_bookmarks/sidebar_test.js
@@ -31,9 +31,10 @@ suite('<bookmarks-sidebar>', function() {
   });
 
   test('selecting and deselecting folders fires event', function() {
-    var firedId;
+    var firedId, clearSearch;
     document.addEventListener('selected-folder-changed', function(e) {
-      firedId = /** @type {string} */ (e.detail);
+      firedId = /** @type {string} */ (e.detail.id);
+      clearSearch = /** @type {string} */ (e.detail.clearSearch);
     });
 
     Polymer.dom.flush();
@@ -47,6 +48,7 @@ suite('<bookmarks-sidebar>', function() {
     firedId = '';
     MockInteractions.tap(secondGen[0].$['folder-label']);
     assertEquals(secondGen[0].item.id, firedId);
+    assertTrue(clearSearch);
 
     // Select folder in a separate subtree.
     firedId = '';