Don't clobber existing history entries. am: b36e57a004

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/18453213

Change-Id: I2bcfe47ee338b69c22bb224e6ec62ff65dc3182b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>