Close panel when media stop

-Add forceClose callback to finish panel
-Add test cases

Bug: 151396986
Test: make -j50 RunSettingsRoboTests
Change-Id: Ic0ac2880a4ff412382816ccb41b4fbb60dbdf519

tests/robotests/src/com/android/settings/panel/PanelFragmentTest.java

@@ -23,6 +23,7 @@ import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
 
 import android.app.settings.SettingsEnums;
 import android.content.Context;
@@ -236,4 +237,17 @@ public class PanelFragmentTest {
         assertThat(headerTitle.getText()).isEqualTo(TITLE2);
         assertThat(headerSubtitle.getText()).isEqualTo(SUBTITLE2);
     }
+
+    @Test
+    public void forceClose_verifyFinish() {
+        initFakeActivity();
+        verify(mFakePanelContent).registerCallback(mPanelContentCbs.capture());
+        final PanelContentCallback panelContentCallbacks = spy(mPanelContentCbs.getValue());
+        when(((PanelFragment.LocalPanelCallback) panelContentCallbacks).getFragmentActivity())
+                .thenReturn(mActivity);
+
+        panelContentCallbacks.forceClose();
+
+        verify(mActivity).finish();
+    }
 }