Merge "Unblocking surface sync if the viewroot dies before traversal can happen" into tm-qpr-dev am: c9425a388f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20965583

Change-Id: I6316086651d035ace0f0af54073c3c9eb7efdb5e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

core/java/android/view/ViewRootImpl.java

@@ -8749,6 +8749,10 @@ public final class ViewRootImpl implements ViewParent,
             mAdded = false;
             AnimationHandler.removeRequestor(this);
         }
+        if (mSyncBufferCallback != null) {
+            mSyncBufferCallback.onBufferReady(null);
+            mSyncBufferCallback = null;
+        }
         WindowManagerGlobal.getInstance().doRemoveView(this);
     }