[demos] Fix Infra-PerCommit-Build.
[demos] Fix Infra-PerCommit-Build.

Bug: skia:11931
Change-Id: I6ff0f53084cf93c87247c7205b80234c4b427ec9
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/441361
Auto-Submit: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>
Commit-Queue: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot