Add Intentfilter BasePreferenceController

For settings which can change in the framework, outside of
the settings app and a slice, a Slice needs to be able to
register a listener for these changes.

Adding a getter for an IntentFilter in BasePreferenceControllers
allows us to use the SliceBroadcastRelay in SysUi to listen for
these changes.

Test: robotests
Fixes: 78138654

Change-Id: I579375069ca98fd21b60cd3a69c1a122cabf96e2
Merged-In: Ifa05b651aaa3458c54866f71469964b1a070e458

tests/robotests/src/com/android/settings/testutils/FakeToggleController.java

@@ -18,6 +18,8 @@
 package com.android.settings.testutils;
 
 import android.content.Context;
+import android.content.IntentFilter;
+import android.net.wifi.WifiManager;
 import android.provider.Settings;
 
 import com.android.settings.core.TogglePreferenceController;
@@ -28,6 +30,9 @@ public class FakeToggleController extends TogglePreferenceController {
 
     public static final String AVAILABILITY_KEY = "fake_toggle_availability_key";
 
+    public static final IntentFilter INTENT_FILTER = new IntentFilter(
+            WifiManager.WIFI_AP_STATE_CHANGED_ACTION);
+
     private final int ON = 1;
     private final int OFF = 0;
 
@@ -52,4 +57,9 @@ public class FakeToggleController extends TogglePreferenceController {
         return Settings.Global.getInt(mContext.getContentResolver(),
                 AVAILABILITY_KEY, AVAILABLE);
     }
+
+    @Override
+    public IntentFilter getIntentFilter() {
+        return INTENT_FILTER;
+    }
 }