Fix up failing DCHECK with --enable-vulkan

Change-Id: I96ef67192107f46e5524a406535c1c1fa51fbc80
Reviewed-on: https://chromium-review.googlesource.com/c/1374392
Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Jonathan Backer <backer@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#616023}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 46fc59f94b92e91f7305e469a1b5b033370ee260
2 files changed