Merge "Add function for flattening 2d lists" am: 8ccac519 am: 6d0c689c am:...

Merge "Add function for flattening 2d lists" am: 8ccac519 am: 6d0c689c am: a307ea51 am: d2159206

Original change: https://android-review.googlesource.com/c/platform/build/+/2088663



Change-Id: I2b39bc068319fc4b235454c4feacb6d91cfc1d9e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>