Fix eglChooseConfig for attributes that have exact default values. The implementation of eglChooseConfig does not match the specification for attributes not provided by the calling function. It is supposed to use the default value and match semantics, per the specification. This is fine for many attributes (where the value in the EGLConfig doesn't matter). Currently, this affects the following attributes: - EGL_COLOR_BUFFER_TYPE - EGL_LEVEL - EGL_RENDERABLE_TYPE - EGL_SURFACE_TYPE - EGL_TRANSPARENT_TYPE - EGL_OPTIMAL_SURFACE_ORIENTATION_ANGLE - EGL_COLOR_COMPONENT_TYPE_EXT This change causes 55 of 65 of the dEQP-EGL.functional.choose_config.* tests to start passing. Bug: angleproject:3172 Change-Id: I287af5ba7d296694d9a78ded5d1e3bc4e7043d03 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1506696 Commit-Queue: Ian Elliott <ianelliott@google.com> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>