Make rotation leash for rotated multi-activity pip expand

When expanding a multi-activity pip, the activity gets reparented
back to its original task. For expanding into a different rotation,
the Task is what held the new rotation, so when the activity is
reparented, it loses that transform. In this case, we need to
create a rotation leash to provide the transform in the task's
place.

Bug: 277452732
Test: play video in netflix (landscape). swipe-to-pip (portrait),
      expand pip (back to landscape).
Change-Id: I70318e2808e46158d20a721e8595651ba3ac8460

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

@@ -4614,6 +4614,13 @@ class Task extends TaskFragment {
                             topActivity.reparent(lastParentBeforePip,
                                     lastParentBeforePip.getChildCount() /* top */,
                                     "movePinnedActivityToOriginalTask");
+                            final DisplayContent dc = topActivity.getDisplayContent();
+                            if (dc != null && dc.isFixedRotationLaunchingApp(topActivity)) {
+                                // Expanding pip into new rotation, so create a rotation leash
+                                // until the display is rotated.
+                                topActivity.getOrCreateFixedRotationLeash(
+                                        topActivity.getSyncTransaction());
+                            }
                             lastParentBeforePip.moveToFront("movePinnedActivityToOriginalTask");
                         }
                     }