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/inputmethod/GameControllerPreferenceController.java

@@ -27,6 +27,7 @@ import android.text.TextUtils;
 import android.view.InputDevice;
 
 import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settings.R;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnPause;
@@ -73,6 +74,11 @@ public class GameControllerPreferenceController extends AbstractPreferenceContro
 
     @Override
     public boolean isAvailable() {
+        // If device explicitly wants to hide this, return early.
+        if (!mContext.getResources().getBoolean(R.bool.config_show_vibrate_input_devices)) {
+            return false;
+        }
+
         final int[] devices = mIm.getInputDeviceIds();
         for (int deviceId : devices) {
             InputDevice device = mIm.getInputDevice(deviceId);