Most of these tests use TranslatorGLSL or TranslatorESSL (often through
ShaderCompileTreeTest).  In specialized builds that disable GLSL and
ESSL shader generation, disable these unit tests.

Bug: chromium:1161513
Change-Id: Ib87e651706f141a41ffdaebfb0cbe5168582e341
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2613202Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>