Fix addLinks for multiple "skia:123" matches
Fix addLinks for multiple "skia:123" matches

BUG=skia:2686
R=rmistry@google.com

Author: borenet@google.com

Review URL: https://codereview.chromium.org/355473002

google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot