{"type":"comment-added",
"change":{"project":"project-name",
           "branch":"branch-name",
           "topic":"topic-name",
           "id":"Ideadbeefdeadbeefdeadbeefdeadbeefdeadbeef",
           "number":"123456",
           "subject":"Commit message subject",
           "owner":{"name":"Owner Name",
                    "email":"owner@example.com"},
           "url":"http://review.example.com/123456"},
 "patchSet":{"number":"4",
             "revision":"deadbeefdeadbeefdeadbeefdeadbeefdeadbeef",
             "ref":"refs/changes/56/123456/4",
             "uploader":{"name":"Uploader Name",
                         "email":"uploader@example.com"},
             "createdOn":1341370514},
 "author":{"name":"Author Name",
           "email":"author@example.com"},
 "approvals":[{"type":"CRVW",
               "description":"Code Review",
               "value":"1"},
              {"type":"VRIF",
               "description":"Verified",
               "value":"1"}],
 "comment":"Review comment"}