mkstub is the tool used to stub the google_apis maps.jar.
Since we're integrating it in the build, we want to control its verbosity.
Change-Id: Ic0cfacb79a0aa260bcafb54bdc6bdb5a98b1c87a
This also reorganizes some source so it's 90% refactoring.
There will be more filtering to do in another CL.
Original author: raphael
Merged from: //branches/cupcake/...
Original author: android-build
Automated import of CL 146829