Introduce boolean flags to show/hide items for Language & input.

This adds seven new boolean flags:
config_show_phone_language
config_show_virtual_keyboard_pref
config_show_physical_keyboard_pref
config_show_spellcheckers_settings
config_show_tts_settings_summary
config_show_pointer_speed
config_show_vibrate_input_devices

Which when individually set to false, will hide the item from "Language
& input" in System. It will also hide them from surfacing in search
results.

Bug: 62379555
Test: Individual controller tests are all updated.

Change-Id: I9ef1c3037b0bec6ffa5a627006507f4f16e534c4

src/com/android/settings/language/PointerSpeedController.java

@@ -0,0 +1,41 @@
+/*
+ * 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.language;
+
+import android.content.Context;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.R;
+
+import android.support.annotation.VisibleForTesting;
+
+
+public class PointerSpeedController extends BasePreferenceController {
+
+    @VisibleForTesting static final String KEY_POINTER_SPEED = "pointer_speed";
+
+    public PointerSpeedController(Context context) {
+        super(context, KEY_POINTER_SPEED);
+    }
+
+    @AvailabilityStatus
+    public int getAvailabilityStatus() {
+        return mContext.getResources().getBoolean(R.bool.config_show_pointer_speed)
+                ? AVAILABLE
+                : DISABLED_UNSUPPORTED;
+    }
+}