ANGLE's VK backend induces a memory and binary size regression due to
global initializers in glslang/spirvtools. Disable it on Android Chrome
official builds.

Bug: chromium:1172451
Change-Id: I08d77cf11e20b393c0faf7c85d08c92061e5a09b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2969385Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
(cherry picked from commit dc334829)
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2994732Reviewed-by: Geoff Lang <geofflang@chromium.org>