Add Chromium to DEPS for CommandBuffer bots

Bug: skia:6951
Change-Id: I094b542c6930e0789db71474650235b3ce991054
Reviewed-on: https://skia-review.googlesource.com/136022
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
8 files changed