Merge "Do not flush when sending view tree appearing event." into udc-dev am: 04b79853

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21475681



Change-Id: Ieb2c8cfcdd07e47f84186d81ea36e810bcc8df92
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>