Add powerPreference unimplemented warning console message to gpu.requestAdapter

Bug: 877147
Change-Id: Id718dc6ebd74a8db0925f085c6df305141ee87ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1547936
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#647777}
1 file changed