Optimize vertex attribute and buffer state change Bug: angleproject:386749841 Change-Id: I25968902282f6a201510e2ee17ea85fd71ef57c7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6483915 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: mohan maiya <m.maiya@samsung.com>