Fix blendable FP32 texture caps on ES2 contexts Although the EXT_float_blend extension is defined only for ES 3.0+, ANGLE exposes it on ES 2.0 client contexts. Bug: angleproject:4595 Change-Id: I7451062ed8b1ab4eb18a8c7c1d37ee7383c8ea4b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2172738 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>