This CL updates the SampleUtils file to use the full path to the header.
This required adding the root path into the include directories for the
sample utils project in CMake.
Bug: dawn:1339
Change-Id: If6abb18a2eefa19ee56b6f889080da67f4a953e3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86211
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>