make vr_assets_profile dir always

This is necessary to make second build no-op.
Without this, following command runs the script always.
$ ninja -C out/android_arm64_dbg_recipe/ gen/tools/perf/contrib/vr_benchmarks/vr_assets_profile

Bug: 914264
Change-Id: I35ff097c6a34318813957b71c690386fc1a7a1e3
Reviewed-on: https://chromium-review.googlesource.com/c/1373734
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615991}
1 file changed