Convert NavigationView to Fragment (1/2)

- Replace NavigationView with DrawerFragment
- Load groups and filters in DrawerFragment, rather than in
  PeopleActivity directly
- based on RecylcerView, which seems more future-proof
- LTR layout and A11Y is handled
- new badge is implemented
- menu selection is implemented

Bug: 34062530

Test: quick sanity check

Change-Id: I630978e64dc4fd386e25cedfd04f53ea2bd8679f
diff --git a/res/layout/drawer_horizontal_divider.xml b/res/layout/drawer_horizontal_divider.xml
new file mode 100644
index 0000000..ca096fa
--- /dev/null
+++ b/res/layout/drawer_horizontal_divider.xml
@@ -0,0 +1,30 @@
+<?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.
+-->
+
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="16dp"
+    android:importantForAccessibility="no">
+
+    <View
+        android:id="@+id/divider_top"
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:layout_gravity="center_vertical"
+        android:background="@color/drawer_divider_color"/>
+</FrameLayout>
\ No newline at end of file