Revert "Remove redundant BlendStateArray tracking" This reverts commit c746ac65e9d64aa74065ee30d7e7e810088c429c. Reason for revert: Possible performance regression BUG=chromium:1085996 Original change's description: > Remove redundant BlendStateArray tracking > > Keep legacy BlendState for now. > > Bug: angleproject:4394 > Change-Id: Icba2b2f3a071d0f838a5480ff94869d35b776d94 > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2169093 > Reviewed-by: Geoff Lang <geofflang@chromium.org> > Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> > Commit-Queue: Kenneth Russell <kbr@chromium.org> TBR=geofflang@chromium.org,kbr@chromium.org,jonahr@google.com,jmadill@chromium.org,lexa.knyazev@gmail.com # Not skipping CQ checks because original CL landed > 1 day ago. Bug: angleproject:4394 Change-Id: Id05b382e951a7256805cffe696325b6b6d940e96 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2246719 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>