[infra] Move Android and GPU maps into gen_tasks.go.

Bug: skia:6637
No-Try: true
Change-Id: I1aa47be9d039e8396f8bbf4e1c7e134fe258a1ce
Reviewed-on: https://skia-review.googlesource.com/19095
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
4 files changed