Using dirty bit notification for D3D11 viewport state BUG=angleproject:1161 This is a continuation of the dirty bit refactor Change-Id: I101f415094dd406f6b0a40cb260f1cbbfec7b62c Reviewed-on: https://chromium-review.googlesource.com/313249 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tryjob-Request: Dian Xiang <dianx@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Dian Xiang <dianx@google.com>