[automerger skipped] Upgrade bundletool to bundletool-20191212.Thu.12 RC00 am: 3b23f6528a -s ours am: 77b83df402 -s ours am: 388ff26590 -s ours am: 42973709ab -s ours

am skip reason: Change-Id I86a44956577cd8de44735450f13bcab72e92f8d9 with SHA-1 141b98b4d5 is in history

Change-Id: I4b9272fac1637b00dac0cf24bb3c72af7c79bf42