Add new Android builder which uses API_LEVEL 26

Bug: skia:6870
Change-Id: Idd9a27518c1123c0a729b4d07461047f5530aae3
Reviewed-on: https://skia-review.googlesource.com/24960
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
5 files changed