Support ASTC decode mode extensions in ANGLE Added support for GL_EXT_texture_compression_astc_decode_mode and GL_EXT_texture_compression_astc_decode_mode_rgb9e5 in ANGLE. Also added corresponding end-to-end tests for ASTC decode mode queries, including ASTC decode mode queries and rendering with ASTC texture formats with different decode modes on GL_TEXTURE_2D works. Bug: angleproject:419403188 Change-Id: I0f2dced8468c4e25597740d1de346b2f699bb81e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6575285 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Alexey Knyazev <lexa.knyazev@gmail.com>