Update sidebar to more closely match material design specs.

Test: n/a
Bug: 35067861
Change-Id: I05aeeebdb8b5798965f4903f739142c327e0f990
diff --git a/res/drawable-ldrtl/roots_list_border.xml b/res/drawable-ldrtl/roots_list_border.xml
new file mode 100644
index 0000000..c8e8457
--- /dev/null
+++ b/res/drawable-ldrtl/roots_list_border.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2017 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<inset xmlns:android="http://schemas.android.com/apk/res/android"
+       android:insetTop="-1dp"
+       android:insetBottom="-1dp"
+       android:insetRight="-1dp">
+    <shape android:shape="rectangle">
+        <stroke
+            android:width="1dp"
+            android:color="@color/drawer_border" />
+    </shape>
+</inset>
\ No newline at end of file