[MD Bookmarks] Add lines between items and no search results message.

chrome/browser/resources/md_bookmarks/list.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_action_menu/cr_action_menu.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/shadow.html">
 <link rel="import" href="chrome://bookmarks/item.html">
 <link rel="import" href="chrome://bookmarks/shared_style.html">
@@ skipping 16 matching lines @@
 
       .centered-message {
         align-items: center;
         color: #6e6e6e;
         display: flex;
         font-size: 14px;
         font-weight: 500;
         height: 100%;
         justify-content: center;
       }
+

[jiaxi, 2017/01/19 04:50:57]

Extra line here.

[angelayang, 2017/01/19 05:00:23]

Done.

     </style>
     <dialog is="cr-action-menu" id="dropdown">
       <button class="dropdown-item" on-tap="onEditTap_">
         $i18n{menuEdit}
       </button>
       <button class="dropdown-item" on-tap="onCopyURLTap_">
         $i18n{menuCopyURL}
       </button>
       <button class="dropdown-item" on-tap="onDeleteTap_">
          $i18n{menuDelete}
@@ skipping 13 matching lines @@
       </div>
       <div class="button-container">
         <paper-button class="cancel-button" on-tap="onCancelEditTap_">
           $i18n{cancelEdit}
         </paper-button>
         <paper-button class="action-button" on-tap="onSaveEditTap_">
           $i18n{saveEdit}
         </paper-button>
       </div>
     </dialog>
-    <div id="bookmarksCard" hidden$="[[isListEmpty_(displayedList.length)]]">
+    <div id="bookmarksCard" hidden$="[[isEmptyList_(displayedList.length)]]">
       <template is="dom-repeat" items="[[displayedList]]" as="item">
-        <bookmarks-item item="[[item]]"></bookmarks-item>
+        <bookmarks-item item="[[item]]"
+            is-last-item="[[isLastItem_(item)]]"></bookmarks-item>
       </template>
     </div>
     <div class="centered-message"
-        hidden$="[[!isListEmpty_(displayedList.length)]]">
-      $i18n{emptyList}
+        hidden$="[[!isEmptyList_(displayedList.length)]]">
+      {{emptyListMessage_(displayedList.length)}}
     </div>
   </template>
   <script src="chrome://bookmarks/list.js"></script>
 </dom-module>