Merge "Export proguard.flags, manifest and sources for use by SettingsGoogle" into rvc-qpr-dev-plus-aosp am: 81062029dd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/13630934

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0f7ae37bc028f422f5c50bef421613ccfc49811a