Empty bookmarks folder display message

* if list is empty and modifiable:
   "To bookmark pages, click the star in the address bar"

* if list is empty and unmodifiable:
   "This folder is empty"

Bug: 798653

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I1cd88758158a7c13abe938f4698180916d0e595a
Reviewed-on: https://chromium-review.googlesource.com/878421
Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: srirama chandra sekhar <srirama.m@samsung.com>
Cr-Commit-Position: refs/heads/master@{#538696}

AUTHORS

@@ -94,6 +94,7 @@ Ashish Kumar Gupta <guptaag@amazon.com>
 Ashlin Joseph <ashlin.j@samsung.com>
 Attila Dusnoki <dati91@gmail.com>
 Avinaash Doreswamy <avi.nitk@samsung.com>
+Ayush Khandelwal <k.ayush@samsung.com>
 Balazs Kelemen <b.kelemen@samsung.com>
 Baul Eun <baul.eun@samsung.com>
 Behara Mani Shyam Patro <behara.ms@samsung.com>

chrome/app/bookmarks_strings.grdp

@@ -399,6 +399,9 @@
   </message>
   <message name="IDS_MD_BOOKMARK_MANAGER_EMPTY_LIST" desc="The message shown when the user has no bookmarks added. 'Star' refers to the icon in the omnibox for adding to bookmarks.">
     To bookmark pages, click the star in the address bar
+  </message>
+   <message name="IDS_MD_BOOKMARK_MANAGER_EMPTY_UNMODIFIABLE_LIST" desc="The message shown when an unmodifiable bookmark folder is empty.">
+    This folder is empty
   </message>
   <message name="IDS_MD_BOOKMARK_MANAGER_FOLDER_LABEL" desc="Label for a folder of bookmarks which is used to label folders for screen reader users.">
     Folder

chrome/browser/resources/md_bookmarks/list.js

@@ -142,7 +142,13 @@ Polymer({
 
   /** @private */
   emptyListMessage_: function() {
-    const emptyListMessage = this.searchTerm_ ? 'noSearchResults' : 'emptyList';
+    let emptyListMessage = 'noSearchResults';
+    if (!this.searchTerm_) {
+      emptyListMessage = bookmarks.util.canReorderChildren(
+                             this.getState(), this.getState().selectedFolder) ?
+          'emptyList' :
+          'emptyUnmodifiableList';
+    }
     return loadTimeData.getString(emptyListMessage);
   },
 

chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc

@@ -54,6 +54,8 @@ content::WebUIDataSource* CreateMdBookmarksUIHTMLSource(Profile* profile) {
   AddLocalizedString(source, "editDialogUrlInput",
                      IDS_BOOKMARK_MANAGER_URL_INPUT_PLACE_HOLDER);
   AddLocalizedString(source, "emptyList", IDS_MD_BOOKMARK_MANAGER_EMPTY_LIST);
+  AddLocalizedString(source, "emptyUnmodifiableList",
+                     IDS_MD_BOOKMARK_MANAGER_EMPTY_UNMODIFIABLE_LIST);
   AddLocalizedString(source, "folderLabel",
                      IDS_MD_BOOKMARK_MANAGER_FOLDER_LABEL);
   AddLocalizedString(source, "itemsSelected",