Don't transfer splash screen if activity is finishing.

Save more unnecessary memory.

Bug: 221703756
Test: atest SplashscreenTests
Test: register exit listener at onCreate and finish activity at onStart,
verify no transfer splash screen happen at all.

Change-Id: If515b0825a56b8899750fde842853724ce17ab41

services/core/java/com/android/server/wm/ActivityRecord.java

@@ -2476,7 +2476,8 @@ final class ActivityRecord extends WindowToken implements WindowManagerService.A
     }
 
     private boolean transferSplashScreenIfNeeded() {
-        if (!mHandleExitSplashScreen || mStartingSurface == null || mStartingWindow == null
+        if (finishing || !mHandleExitSplashScreen || mStartingSurface == null
+                || mStartingWindow == null
                 || mTransferringSplashScreenState == TRANSFER_SPLASH_SCREEN_FINISH) {
             return false;
         }