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 <bradfitz@golang.org>

gerrit/gerrit.go

@@ -215,11 +215,14 @@ type ApprovalInfo struct {
 // obtained by adding o parameters as described at:
 // https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#list-changes
 type RevisionInfo struct {
-	Commit  *CommitInfo           `json:"commit"`
-	Files   map[string]*FileInfo  `json:"files"`
+	Draft          bool                  `json:"draft"`
+	PatchSetNumber int                   `json:"_number"`
 	Created        TimeStamp             `json:"created"`
+	Uploader       *AccountInfo          `json:"uploader"`
 	Ref            string                `json:"ref"`
 	Fetch          map[string]*FetchInfo `json:"fetch"`
+	Commit         *CommitInfo           `json:"commit"`
+	Files          map[string]*FileInfo  `json:"files"`
 	// TODO: more
 }