Make onVirtualDisplayRemoved callback idempotent.

... by not throwing an exception if it's invoked multiple times /
for already released display id.

Bug: 292284597
Test: atest VirtualDisplayTest
Change-Id: I151eafc1f4c2ea3fb5c8ed966965fe7efbd9cc56

services/companion/java/com/android/server/companion/virtual/VirtualDeviceImpl.java

@@ -927,8 +927,9 @@ final class VirtualDeviceImpl extends IVirtualDevice.Stub
         }
 
         if (virtualDisplayWrapper == null) {
-            throw new IllegalStateException(
+            Slog.w(TAG, "Virtual device " + mDeviceId + " doesn't have a virtual display with ID "
-                    "Virtual device doesn't have a virtual display with ID " + displayId);
+                    + displayId);
+            return;
         }
 
         final long ident = Binder.clearCallingIdentity();

services/tests/servicestests/src/com/android/server/companion/virtual/VirtualDeviceManagerServiceTest.java

@@ -789,13 +789,6 @@ public class VirtualDeviceManagerServiceTest {
                 nullable(String.class), eq(DISPLAY_ID_1), eq(null));
     }
 
-    @Test
-    public void onVirtualDisplayRemovedLocked_unknownDisplayId_throwsException() {
-        final int unknownDisplayId = 999;
-        assertThrows(IllegalStateException.class,
-                () -> mDeviceImpl.onVirtualDisplayRemoved(unknownDisplayId));
-    }
-
     @Test
     public void onVirtualDisplayRemovedLocked_wakeLockIsReleased() throws RemoteException {
         addVirtualDisplay(mDeviceImpl, DISPLAY_ID_1);