Trying to patch in http://crrev.com/c/527421, I got the following:

$ git cl patch 527421
remote: Counting objects: 333503, done
remote: Finding sources: 100% (25/25)
remote: Total 25 (delta 0), reused 18 (delta 0)
Unpacking objects: 100% (25/25), done.
From https://chromium.googlesource.com/chromium/src
 * branch                      refs/changes/21/527421/3 -> FETCH_HEAD
error: unknown option `ancestor'
usage: git merge-base [-a | --all] <commit> <commit>...
   or: git merge-base [-a | --all] --octopus <commit>...
   or: git merge-base --independent <commit>...
   or: git merge-base --is-ancestor <commit> <commit>
   or: git merge-base --fork-point <ref> [<commit>]

    -a, --all             output all common ancestors
    --octopus             find ancestors for a single n-way merge
    --independent         list revs not reachable from others
    --is-ancestor         is the first one ancestor of the other?
    --fork-point          find where <commit> forked from reflog of <ref>

error: unknown option `ancestor'
usage: git merge-base [-a | --all] <commit> <commit>...
   or: git merge-base [-a | --all] --octopus <commit>...
   or: git merge-base --independent <commit>...
   or: git merge-base --is-ancestor <commit> <commit>
   or: git merge-base --fork-point <ref> [<commit>]

    -a, --all             output all common ancestors
    --octopus             find ancestors for a single n-way merge
    --independent         list revs not reachable from others
    --is-ancestor         is the first one ancestor of the other?
    --fork-point          find where <commit> forked from reflog of <ref>

It looks like you're on a branch with some local commits.
 not be able to easily upload further changes based on it.will 
Would you like to proceed with applying this patch anyway?
ess Enter to confirm, or Ctrl+C to abort