Prevent updating the PiP when it is being dismissed.

Bug: 35588768
Test: android.server.cts.ActivityManagerPinnedStackTests
Test: #testPreventSetAspectRatioWhileExpanding

Change-Id: I2bcfdaad97c552cccef253370a6231253c956d22
diff --git a/services/core/java/com/android/server/am/PinnedActivityStack.java b/services/core/java/com/android/server/am/PinnedActivityStack.java
index aa7ab15..1708fe5 100644
--- a/services/core/java/com/android/server/am/PinnedActivityStack.java
+++ b/services/core/java/com/android/server/am/PinnedActivityStack.java
@@ -52,4 +52,8 @@
     void setPictureInPictureActions(List<RemoteAction> actions) {
         getWindowContainerController().setPictureInPictureActions(actions);
     }
+
+    boolean isBoundsAnimatingToFullscreen() {
+        return getWindowContainerController().isBoundsAnimatingToFullscreen();
+    }
 }