android-sdk: install platform-27

This CL, in addition to the existing Android SDK, installs Android
platform-27 since it is required for some ARC tests.

BUG=b:174712817
TEST=emerge android-sdk
     Verified that platform-27 gets installed correctly in
     /opt/android-sdk/platform

Change-Id: I60935e6d0ab8fd075afd12528e6537b85b0b0dd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2570694
Tested-by: Ricardo Quesada <ricardoq@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Saho Kobayashi <sahok@chromium.org>
Reviewed-by: Shuhei Takahashi <nya@chromium.org>
Auto-Submit: Ricardo Quesada <ricardoq@chromium.org>
Commit-Queue: Ricardo Quesada <ricardoq@chromium.org>
3 files changed