Build compiler_tests only if GLSL or ESSL build is enabled 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/+/2613202 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>