Add meta data for panel

Test: build
Bug: 257283506
Change-Id: I656b81fe3faef442c5780985495dad900a1dab57

core/java/android/service/controls/ControlsProviderService.java

@@ -54,6 +54,20 @@ public abstract class ControlsProviderService extends Service {
     public static final String SERVICE_CONTROLS =
             "android.service.controls.ControlsProviderService";
 
+    /**
+     * Manifest metadata to show a custom embedded activity as part of device controls.
+     *
+     * The value of this metadata must be the {@link ComponentName} as a string of an activity in
+     * the same package that will be launched as part of a TaskView.
+     *
+     * The activity must be exported, enabled and protected by
+     * {@link Manifest.permission.BIND_CONTROLS}.
+     *
+     * @hide
+     */
+    public static final String META_DATA_PANEL_ACTIVITY =
+            "android.service.controls.META_DATA_PANEL_ACTIVITY";
+
     /**
      * @hide
      */