For #1968 - Adds menu option to add new folder in BookmarkFragment menu

app/src/main/java/org/mozilla/fenix/library/bookmarks/BookmarkFragment.kt

@@ -131,7 +131,7 @@ class BookmarkFragment : Fragment(), BackHandler, AccountObserver {
 
                 activity?.run {
                     ViewModelProviders.of(this).get(BookmarksSharedViewModel::class.java)
-                }!!.selectedFolder = null
+                }!!.selectedFolder = currentRoot
             }
         }
     }
@@ -152,7 +152,7 @@ class BookmarkFragment : Fragment(), BackHandler, AccountObserver {
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
         when (val mode = (bookmarkComponent.uiView as BookmarkUIView).mode) {
             BookmarkState.Mode.Normal -> {
-                inflater.inflate(R.menu.library_menu, menu)
+                inflater.inflate(R.menu.bookmarks_menu, menu)
             }
             is BookmarkState.Mode.Selecting -> {
                 inflater.inflate(R.menu.bookmarks_select_multi, menu)
@@ -326,6 +326,14 @@ class BookmarkFragment : Fragment(), BackHandler, AccountObserver {
                     .popBackStack(R.id.libraryFragment, true)
                 true
             }
+            R.id.add_bookmark_folder -> {
+                nav(
+                    R.id.bookmarkFragment,
+                    BookmarkFragmentDirections
+                        .actionBookmarkFragmentToBookmarkAddFolderFragment()
+                )
+                true
+            }
             R.id.open_bookmarks_in_new_tabs_multi_select -> {
                 getSelectedBookmarks().forEach { node ->
                     node.url?.let {

app/src/main/res/drawable/ic_folder_new.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="?primaryText"
+      android:pathData="M19.5,6h-6.76l-2.53,-2.34A2.53,2.53 0,0 0,8.51 3h-4A2.5,2.5 0,0 0,2 5.5v12A2.5,2.5 0,0 0,4.5 20L13,20a1,1 0,0 0,0 -2L4.5,18a0.5,0.5 0,0 1,-0.5 -0.5L4,8h15.5a0.5,0.5 0,0 1,0.5 0.5L20,15a1,1 0,1 0,2 0L22,8.5A2.5,2.5 0,0 0,19.5 6zM4,7L4,5.5a0.5,0.5 0,0 1,0.5 -0.5h4a0.51,0.51 0,0 1,0.34 0.13l2,1.87zM21.5,18L19,18v-2.5a0.5,0.5 0,0 0,-1 0L18,18h-2.5a0.5,0.5 0,0 0,0 1L18,19v2.5a0.5,0.5 0,0 0,1 0L19,19h2.5a0.5,0.5 0,0 0,0 -1z"/>
+</vector>

app/src/main/res/menu/bookmarks_menu.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+    <item
+        android:id="@+id/add_bookmark_folder"
+        android:icon="@drawable/ic_folder_new"
+        android:iconTint="?primaryText"
+        android:title="@string/bookmark_add_folder"
+        app:showAsAction="ifRoom"
+        tools:targetApi="o" />
+    <item
+        android:id="@+id/libraryClose"
+        android:icon="@drawable/ic_close"
+        android:iconTint="?primaryText"
+        android:title="@string/content_description_close_button"
+        app:showAsAction="ifRoom"
+        tools:targetApi="o" />
+</menu>

app/src/main/res/navigation/nav_graph.xml

@@ -201,6 +201,9 @@
         <action
             android:id="@+id/action_bookmarkFragment_to_shareFragment"
             app:destination="@id/shareFragment" />
+        <action
+            android:id="@+id/action_bookmarkFragment_to_bookmarkAddFolderFragment"
+            app:destination="@id/bookmarkAddFolderFragment" />
     </fragment>
 
     <fragment