This path lets us locate the src folder with respect to the
generated output folder, for the pregenerated projects.

Change-Id: I5cf36f35f68638572bc1a8aec1f570edf76a1c74
Reviewed-on: https://chromium-review.googlesource.com/178521Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Commit-Queue: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Shannon Woods <shannonwoods@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>