run-test build: Explicitly call generate-sources am: ab007c5446 am: 2e401ca982

Original change: https://android-review.googlesource.com/c/platform/art/+/2265584

Change-Id: Ide35a85c33fe7ee7c19d8ba1358e9850ab4166f4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>