Add NeedsChromeSourceResponse.builds_chrome.

Some of the prebuilts analysis would benefit from knowing if the builder
would build chrome.  That is available with the old-n-otherwise-buggy
approach, but was not included in the new approach.

BUG=chromium:1088059, chromium:1086714
TEST=generate.

Change-Id: I8087e977aec5a1fbe55cac9f9d7ccf814ca8b1ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2378572
Tested-by: LaMont Jones <lamontjones@chromium.org>
Auto-Submit: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: Alex Klein <saklein@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
2 files changed