Fix NPE when calculateTransitionInfo

mParent can only be organized window.

Bug: 194112093
Test: cts/framework/gce-presubmit-wm-cloud-tf-1-shelltransit
Change-Id: Iabe7e7998326defb7c58d31c943f2fc2531a82fe

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

@@ -1080,6 +1080,10 @@ class Transition extends Binder implements BLASTSyncEngine.TransactionReadyListe
             for (WindowContainer<?> p = wc.getParent(); p != null; p = p.getParent()) {
                 final ChangeInfo parentChange = changes.get(p);
                 if (parentChange == null || !parentChange.hasChanged(p)) break;
+                if (p.mRemoteToken == null) {
+                    // Intermediate parents must be those that has window to be managed by Shell.
+                    continue;
+                }
                 if (parentChange.mParent != null && !skipIntermediateReports) {
                     changes.get(wc).mParent = p;
                     // The chain above the parent was processed.

services/tests/wmtests/src/com/android/server/wm/TransitionTests.java

@@ -739,6 +739,9 @@ public class TransitionTests extends WindowTestsBase {
             }
             from = from.getParent();
         }
+        if (end.asDisplayArea() != null) {
+            end.asDisplayArea().mOrganizer = organizer;
+        }
     }
 
     /** Fill the change map with all the parents of top. Change maps are usually fully populated */