Only update the synced parts of mAppliedAttributes. Members such as divisor are not synced in VertexArrayGL::updateAttribPointer so assigning the whole attribute causes the divisor to not be synced. BUG=angleproject:1136 Change-Id: I947a144f81ae67953947e363debd1d1cff78207a Reviewed-on: https://chromium-review.googlesource.com/295145 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>