Add a setting to enable or disable corner invocation of assistant app

This setting allows the user to disable the bottom corner swipe gesture when they have system navigation set to corner gestures.

Bug: 179673792
Test: Verified on a physical device
      Ran robolectric unit tests for gesture settings package
Change-Id: Ib4e818e884c36ddfafaf4e8c75d81e01a13a5831

src/com/android/settings/gestures/GestureNavigationSettingsAssistController.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2021 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.gestures;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import com.android.settings.core.TogglePreferenceController;
+
+/**
+ * Configures behaviour of corner swipe to invoke assistant app gesture.
+ */
+public class GestureNavigationSettingsAssistController extends TogglePreferenceController {
+
+    // This value is based on SystemUI/src/com/android/systemui/navigationbar/NavigationBar.java
+    // behaviour. We assume that the gestures are enabled by default.
+    private static final int ASSIST_TOUCH_GESTURE_DEFAULT_VALUE = 1;
+
+    public GestureNavigationSettingsAssistController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Secure.ASSIST_TOUCH_GESTURE_ENABLED, ASSIST_TOUCH_GESTURE_DEFAULT_VALUE)
+                == 1;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.ASSIST_TOUCH_GESTURE_ENABLED, isChecked ? 1 : 0);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return SystemNavigationPreferenceController.isGestureAvailable(mContext) ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+}