gerrit: Add additional RevisionInfo fields
gerrit: Add additional RevisionInfo fields

Adds fields for the 'draft' flag, patch set number, and revision uploader.

Change-Id: I3780e2df046d9fe1065a6dc1b39400b4ea049d3a
Reviewed-on: https://go-review.googlesource.com/13936
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

proppy/build,proppy/build,proppy/build,golang/build,golang/build,evandbrown/build,evandbrown/build,proppy/build,golang/build,golang/build,evandbrown/build