Add settings for the assist gesture.

Availability of the gesture is gated by a new FeatureProvider.

Test: make -j RunSettingsRoboTests; manual test on
      supported/unsupported configurations.

Change-Id: I3529367a73e33370d5112b91d5144293ffa7fa22

res/xml/assist_gesture_settings.xml

@@ -0,0 +1,32 @@
+<?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.
+  -->
+
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+                  xmlns:app="http://schemas.android.com/apk/res-auto"
+                  android:title="@string/assist_gesture_title">
+
+    <com.android.settings.widget.VideoPreference
+        android:key="gesture_assist_video"
+        app:animation="@raw/gesture_assist"
+        app:preview="@drawable/gesture_assist" />
+
+    <SwitchPreference
+        android:key="gesture_assist"
+        android:title="@string/assist_gesture_title"
+        android:summary="@string/assist_gesture_summary" />
+
+</PreferenceScreen>

res/xml/gesture_settings.xml

@@ -19,6 +19,13 @@
     android:title="@string/gesture_preference_title"
     settings:keywords="@string/keywords_gesture">
 
+    <com.android.settings.gestures.GesturePreference
+        android:key="gesture_assist"
+        android:title="@string/assist_gesture_title"
+        android:summary="@string/assist_gesture_summary"
+        settings:animation="@raw/gesture_assist"
+        settings:preview="@drawable/gesture_assist"/>
+
     <com.android.settings.gestures.GesturePreference
         android:key="gesture_swipe_down_fingerprint"
         android:title="@string/fingerprint_swipe_for_notifications_title"
@@ -54,4 +61,4 @@
         settings:animation="@raw/gesture_ambient_lift"
         settings:preview="@drawable/gesture_ambient_lift"/>
 
-</PreferenceScreen>
+</PreferenceScreen>

res/xml/language_and_input.xml

@@ -52,6 +52,11 @@
         android:key="gesture_settings_category"
         android:title="@string/gesture_preference_title">
 
+        <Preference
+            android:key="gesture_assist"
+            android:title="@string/assist_gesture_title"
+            android:fragment="com.android.settings.gestures.AssistGestureSettings"/>
+
         <Preference
             android:key="gesture_swipe_down_fingerprint"
             android:title="@string/fingerprint_swipe_for_notifications_title"
@@ -114,4 +119,4 @@
 
     </PreferenceCategory>
 
-</PreferenceScreen>
+</PreferenceScreen>

res/xml/manage_assist.xml

@@ -24,6 +24,11 @@
         android:title="@string/default_assist_title"
         android:summary="@string/default_assist_none"/>
 
+    <Preference
+        android:key="gesture_assist"
+        android:title="@string/assist_gesture_title"
+        android:fragment="com.android.settings.gestures.AssistGestureSettings"/>
+
     <SwitchPreference
         android:key="context"
         android:title="@string/assist_access_context_title"