The StreamDraw usage flag was changed to a static type in http://crrev.com/50eb1e6f77b3b0ad89d2cd00efc0d1d673365296 but it appears to have regressed performance in several Chrome benchmarks because Skia uses it as a usage flag for buffers that change data frequently. BUG=angleproject:3366 BUG=953788 BUG=954028 Change-Id: Ib6805d94714bcd1679f3c9c49f1b70574f0b658a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1582786Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Geoff Lang <geofflang@chromium.org>
