Read later: Add reading list folder icon.

This CL adds the folder icon provided by UX designer. Converted from
svg file to xml in Android studio. The color is modified to use chrome
color.

Bug: 1133496
Change-Id: I1d8ecca180480653a078cdd1ab37bae8102c634e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538471Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828504}

chrome/android/chrome_java_resources.gni

@@ -670,6 +670,7 @@ chrome_java_resources = [
   "java/res/drawable/ic_open_in_browser.xml",
   "java/res/drawable/ic_person_add_40dp.xml",
   "java/res/drawable/ic_photo_camera_black.xml",
+  "java/res/drawable/ic_reading_list_folder.xml",
   "java/res/drawable/ic_settings_black.xml",
   "java/res/drawable/ic_share_small.xml",
   "java/res/drawable/ic_signal_cellular_0_bar.xml",

chrome/android/expectations/lint-suppressions.xml

@@ -235,7 +235,8 @@ Still reading?
     <ignore regexp="The resource `R.string.accessibility_close_tab_group_button_with_group_name` appears to be unused"/>
     <ignore regexp="The resource `R.string.accessibility_expand_tab_group_with_group_name` appears to be unused"/>
 
-    <!-- crbug.com/1128074 remove this line and following 12 lines after the bug is resolved -->
+    <!-- crbug.com/1128074 remove this line and following 15 lines after the bug is resolved -->
+    <ignore regexp="The resource `R.drawable.ic_reading_list_folder` appears to be unused"/>
     <ignore regexp="The resource `R.string.reading_list_title` appears to be unused"/>
     <ignore regexp="The resource `R.string.reading_list_read` appears to be unused"/>
     <ignore regexp="The resource `R.string.reading_list_unread` appears to be unused"/>

chrome/android/java/res/drawable/ic_reading_list_folder.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2020 The Chromium Authors. All rights reserved.
+     Use of this source code is governed by a BSD-style license that can be
+     found in the LICENSE file. -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M11.0278,7.1389H16.8611V9.0833H11.0278V7.1389ZM11.0278,11.0278H16.8611V12.9722H11.0278V11.0278ZM11.0278,14.9167H16.8611V16.8611H11.0278V14.9167ZM7.1389,7.1389H9.0833V9.0833H7.1389V7.1389ZM7.1389,11.0278H9.0833V12.9722H7.1389V11.0278ZM7.1389,14.9167H9.0833V16.8611H7.1389V14.9167ZM19.875,3.25H4.125C3.6389,3.25 3.25,3.6389 3.25,4.125V19.875C3.25,20.2639 3.6389,20.75 4.125,20.75H19.875C20.2639,20.75 20.75,20.2639 20.75,19.875V4.125C20.75,3.6389 20.2639,3.25 19.875,3.25V3.25ZM18.8056,18.8056H5.1944V5.1944H18.8056V18.8056Z"
+      android:fillColor="@color/modern_blue_600"/>
+</vector>