[DEPS] Add vars to DEPS file

This allows gclient to execute if parent project doesn't define
used gclient variables.

Change-Id: I52545179f1212e1c3d64eaf95d2828299f9d3933
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/third_party/instrumented_libraries/+/5582297
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
1 file changed