Under "recent location requests", add "See all"

Under Settings -> Security & Location -> Location, add "See all" button
under recent location requests

On location settings page, display at most 3 recent location requests.
If there are more than 3, show a "see all" button.
When user clicks "See all", take them to a new fragment with all recent
location requests.

Test: Robo
Test: Manual
Bug: 70350519
Change-Id: Id1f9a8da1593814a8f30f8e6ec8ac75fb10f6672

res/xml/location_recent_requests_see_all.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 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.
+-->
+
+
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+        android:title="@string/location_category_recent_location_requests"
+        android:key="recent_location_requests_see_all">
+
+        <PreferenceCategory
+            android:key="all_recent_location_requests"/>
+</PreferenceScreen>