D3D: Don't test for device loss as frequenty in tight loops. BUG=angleproject:1472 BUG=621240 Change-Id: I723839bd7961167adddcccc680638ae066eacea3 Reviewed-on: https://chromium-review.googlesource.com/1025645 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>