Use googletest nested DEPS file.
Use googletest nested DEPS file.

This will fix the issue where gclient didn't support checking
out DEPS-inside-DEPS. We pass a 'googletest_revision' variable
to third_party/googletest via recursedeps.

Bug: chromium:1017514
Change-Id: I4ef3785e385775910f24e13e60e284b8ab2996d6
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1881023
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle