The topic tag can be attached to a change during upload by suffixing
the 'refs/for/branch_name' with the topic label, treating the branch
as though it were a directory.
For example, to tag 'exp/nosql' onto a change headed for the
'sandbox/future-stuff' branch, git push can be used as:
git push URL HEAD:refs/for/sandbox/future-stuff/exp-nosql
If the topic is supplied, it is displayed in the branch column of
a change, in parens. If no topic was set, only the branch is shown.
Bug: issue 51
Change-Id: I07d6c137fc9aefa8c1ee1652bf1e7bcde9d33674
Signed-off-by: Shawn O. Pearce <sop@google.com>
d50c94e759