Deprecate AppListPreference and AppListPrefWithSettings

- Convert ManageAssist into DashboardFragment
- Convert default assist pref to DefaultAppPickerFragment
- Add PreferenceController for each pref
- Add tests

Bug: 35203386
Test: make RunSettingsRoboTests

Change-Id: I0350a06cae7457809fb261e2d8ec99eda80cc50a

src/com/android/settings/applications/assist/GestureAssistPreferenceController.java

@@ -0,0 +1,46 @@
+/*
+ * 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.
+ */
+
+package com.android.settings.applications.assist;
+
+import android.content.Context;
+
+import com.android.settings.core.PreferenceController;
+import com.android.settings.gestures.AssistGestureFeatureProvider;
+import com.android.settings.overlay.FeatureFactory;
+
+public class GestureAssistPreferenceController extends PreferenceController {
+
+    private static final String KEY_ASSIST_GESTURE = "gesture_assist";
+
+    private AssistGestureFeatureProvider mFeatureProvider;
+
+    public GestureAssistPreferenceController(Context context) {
+        super(context);
+        mFeatureProvider = FeatureFactory.getFactory(context)
+                .getAssistGestureFeatureProvider();
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mFeatureProvider.isSupported(mContext);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_ASSIST_GESTURE;
+    }
+}