Add slice for dynamic grouping in output switcher

-Add group operation slice to edit the group and do the volume adjustment
-Add grouping API in slice worker
-Add test cases

Bug: 146813761
Test: make -j42 RunSettingsRoboTests
Change-Id: Ide0df5e3934bc8ac68aaa67fcbd6173a4454ac7f

src/com/android/settings/media/MediaDeviceUpdateWorker.java

@@ -146,6 +146,34 @@ public class MediaDeviceUpdateWorker extends SliceBackgroundWorker
         return mTopDevice;
     }
 
+    boolean addDeviceToPlayMedia(MediaDevice device) {
+        return mLocalMediaManager.addDeviceToPlayMedia(device);
+    }
+
+    boolean removeDeviceFromPlayMedia(MediaDevice device) {
+        return mLocalMediaManager.removeDeviceFromPlayMedia(device);
+    }
+
+    List<MediaDevice> getSelectableMediaDevice() {
+        return mLocalMediaManager.getSelectableMediaDevice();
+    }
+
+    List<MediaDevice> getSelectedMediaDevice() {
+        return mLocalMediaManager.getSelectedMediaDevice();
+    }
+
+    void adjustSessionVolume(int volume) {
+        mLocalMediaManager.adjustSessionVolume(volume);
+    }
+
+    int getSessionVolumeMax() {
+        return mLocalMediaManager.getSessionVolumeMax();
+    }
+
+    int getSessionVolume() {
+        return mLocalMediaManager.getSessionVolume();
+    }
+
     /**
      * Find the active MediaDevice.
      *
@@ -170,6 +198,10 @@ public class MediaDeviceUpdateWorker extends SliceBackgroundWorker
         });
     }
 
+    String getPackageName() {
+        return mPackageName;
+    }
+
     private class DevicesChangedBroadcastReceiver extends BroadcastReceiver {
         @Override
         public void onReceive(Context context, Intent intent) {