Summary:
Context: https://fb.workplace.com/groups/735885229793428/permalink/2329819300400005/
A large number of RN SSTs (https://fburl.com/screenshot_tests/itlks3mn) stopped working last week. Turns out I silently broke them with D13981728.
The issue is that SSTs were being run with `RCTRunningInTestEnvironment == false`. When D13981728 changed that, borders began drawing from a different code path (this diff). Somehow, using the graphics context to draw borders breaks https://fburl.com/pcce4y0h in SSTs.
Going forward, it doesn't make any sense to me why borders should be drawn any differently when testing.
Reviewed By: sahrens
Differential Revision: D14109654
fbshipit-source-id: b8a5c01b923c93c32a8fa8954a850070f55764bc
Peter Argany
cd778873f0