Bug: N/A
Test: manual
Change-Id: Ided170a655d5efe5a3026ceb7bd385ed91baa347

Showing the things you need to fix in green was surprising to me.

Errors and successfully determining that a project is stale both deserve
to be red, but use bold so that we can see the projects that need to be
updated even while there are lots of unsupported METADATA files.

Bug: N/A
Test: manual
Change-Id: Idad71a46c675b19d1fa204268c27816375f3e394

Add the support to check how far a project is behind upstream git.

Still need to manually run git merge. But this tool can help update
METADATA. :)

Test: ./updater.sh update perf_data_converter
Change-Id: Ic46a0eb723ae22f0fc7d61a67a14299761b564a4

Bug: 109748616
Test: https://android-review.googlesource.com/c/platform/external/kotlinc/+/699886
Change-Id: I1c28aa256bca6ee5be1ea15f295c5e0fa63526d1