gerrit: add WebLinks field to ProjectInfo

Make its content available to callers, like already done in TagInfo.

Change-Id: Id3bc06d905378e89362f9e8e05e8211e87b1c084
GitHub-Last-Rev: 36e8a8686e
GitHub-Pull-Request: golang/build#34
Reviewed-on: https://go-review.googlesource.com/c/build/+/314809
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

gerrit/gerrit.go

@@ -725,6 +725,7 @@ type ProjectInfo struct {
 	Description string            `json:"description"`
 	State       string            `json:"state"`
 	Branches    map[string]string `json:"branches"`
+	WebLinks    []WebLinkInfo     `json:"web_links,omitempty"`
 }
 
 // ListProjects returns the server's active projects.