Update bug IDs for some shadow sampler failures. BUG=angleproject:1436 Change-Id: I4f6c2eaf4bcb2f85fe31c0e0112c0a9651d4ad70 Reviewed-on: https://chromium-review.googlesource.com/357161 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>