Export proguard.flags, manifest and sources for use by SettingsGoogle

This relands I3d2f042a9ebf4a6f551449904eb77a34f637f28f.

Bug: 175124789
Change-Id: I1cc3796f31e7db3d8f062436ebc618d93db19822
Test: m SettingsGoogle
Test: m RunSettingsGoogleRoboTests
1 file changed