Docs: Add glmark2 instructions for Android
Docs: Add glmark2 instructions for Android

Bug: angleproject:3125
Change-Id: I0d185ad70b960d0c3bff971eb6658893b308352d
Reviewed-on: https://chromium-review.googlesource.com/c/1456481
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Shahbaz Youssefi <582eeec4f08a2ccd61e3ef52115e6e7c571582de@chromium.org>
Commit-Queue: Cody Northrop <94770d7fe1cce6ea0791fa9927c1107de4d2e37b@google.com>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle