[automerger skipped] Merge "Support for showing percent progress in boot animation." am: 87d840addd am: b86c3a3470 am: 8bd985efd4 -s ours

am skip reason: Change-Id I2d936e3391f56796308c90deb39ecacc58797721 with SHA-1 41fffb49d5 is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1545805

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7e651d602ae7c47963897190f11142ec8f5252ba