Use FixedVector for Framebuffer::mDirtyColorAttachmentBindings Bug: chromium:1336126 Change-Id: Ie997af106de09468c8520187190a857db099dff9 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3829144 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Auto-Submit: Peng Huang <penghuang@chromium.org>