ES31: Add missing checks for querying GL_COMPUTE_WORK_GROUP_SIZE This patch adds missing checks for querying GL_COMPUTE_WORK_GROUP_SIZE by glGetProgramiv. When querying GL_COMPUTE_WORK_GROUP_SIZE, an INVALID_OPERATION error should be generated when this program hasn't been linked successfully or it doesn't contain any objects to form a compute shader. BUG=angleproject:2324 TEST=angle_end2end_tests dEQP-GLES31.functional.debug.negative_coverage.get_error.compute.invalid_program_query Change-Id: I13dcebef8a0abede5c18a038d4cf915ee4164e2e Reviewed-on: https://chromium-review.googlesource.com/933627 Commit-Queue: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>