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

src/com/android/settings/core/BasePreferenceController.java

@@ -15,6 +15,7 @@ package com.android.settings.core;
 
 import android.annotation.IntDef;
 import android.content.Context;
+import android.content.IntentFilter;
 import android.text.TextUtils;
 import android.util.Log;
 
@@ -220,6 +221,14 @@ public abstract class BasePreferenceController extends AbstractPreferenceControl
         return SliceData.SliceType.INTENT;
     }
 
+    /**
+     * @return an {@link IntentFilter} that includes all broadcasts which can affect the state of
+     * this Setting.
+     */
+    public IntentFilter getIntentFilter() {
+        return null;
+    }
+
     /**
      * Updates non-indexable keys for search provider.
      *