New UX for app usage screen

Now uses ManageApplications base, and has a details screen which has
a switch and a link to optional app settings.

Bug: 20290386
Change-Id: If32ce8d82e55f3908644c575925b3f6506a68e6e

res/xml/security_settings_misc.xml

@@ -117,7 +117,11 @@
 
         <Preference android:key="usage_access"
                     android:title="@string/usage_access_title"
-                    android:fragment="com.android.settings.UsageAccessSettings"/>
+                    android:fragment="com.android.settings.applications.ManageApplications">
+            <extra
+                android:name="classname"
+                android:value="com.android.settings.Settings$UsageAccessSettingsActivity" />
+        </Preference>
 
     </PreferenceCategory>
 

res/xml/usage_access_details.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 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"
+    xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
+    android:title="@string/usage_access">
+
+    <SwitchPreference
+        android:key="usage_switch"
+        android:title="@string/permit_usage_access" />
+
+    <Preference
+        android:key="app_usage_preference"
+        android:title="@string/app_usage_preference" />
+
+    <Preference
+        android:summary="@string/usage_access_description"
+        android:selectable="false" />
+
+</PreferenceScreen>