Implement previously connected device UI

* For fix the conflicts in pi-dev, cherry pick the commit 86d3e58c8d in
master and merge the conflict.
* Add @SearchIndexable in
PreviouslyConnectedDeviceDashboardFragment.java
* Move save device group to "Previously connected devices" preference

Bug: 74134939
Test: make -j60 RunSettingsRoboTests
Change-Id: Iff7894033df402d42dcc0ccaea6db3106edb7013
Merged-In: Iff7894033df402d42dcc0ccaea6db3106edb7013

res/drawable/ic_devices_other_black.xml

@@ -0,0 +1,29 @@
+<!--
+    Copyright 2018 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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:viewportWidth="24"
+        android:viewportHeight="24"
+        android:width="24dp"
+        android:height="24dp">
+    <path android:fillColor="#FF000000"
+          android:pathData="M3 6h18V4H3C1.9 4 1 4.9 1 6v12c0 1.10.9 2 2 2h4v-2H3V6z M13 12H9
+          v1.78C8.39 14.33 8 15.11 8 16c0 0.89 0.39 1.67 1 2.22 V20h4v-1.78c0.61-0.55 1-1.34
+          1-2.22s-0.39-1.67-1-2.22V12z M11 17.5c-0.83 0-1.5-0.67-1.5-1.5s0.67-1.5 1.5-1.5s1.5
+          0.67 1.5 1.5 S11.83 17.5 11 17.5z M22 8h-6c-0.5 0-1 0.5-1 1v10c0 0.5 0.5 1 1
+          1h6c0.5 0 1-0.5 1-1V9C23 8.5 22.5 8 22 8z M21 18h-4v-8h4V18z" />
+    <path android:fillColor="#00000000"
+          android:pathData="M0 0h24v24H0V0z"/>
+</vector>