Unblocking surface sync if the viewroot dies before traversal can happen

Bug: 260135164
Test: Verified the code flow as the cause of bug
Change-Id: Ie168b7cb772f6ec89063a42a7b15e7d5342f5bd3
Merged-in: Ie168b7cb772f6ec89063a42a7b15e7d5342f5bd3

core/java/android/view/ViewRootImpl.java

@@ -8747,6 +8747,10 @@ public final class ViewRootImpl implements ViewParent,
             mAdded = false;
             AnimationHandler.removeRequestor(this);
         }
+        if (mSyncBufferCallback != null) {
+            mSyncBufferCallback.onBufferReady(null);
+            mSyncBufferCallback = null;
+        }
         WindowManagerGlobal.getInstance().doRemoveView(this);
     }