Simplify directory creation in canvas WPT generator
Bug: 364549423
Change-Id: I42ddc8b332752eb66ca7efa35b100bc41c672b77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5840027
Reviewed-by: Andres Ricardo Perez andresrperez@chromium.org
Commit-Queue: Jean-Philippe Gravel jpgravel@chromium.org
Cr-Commit-Position: refs/heads/main@{#1351760}