Dispatch Graphite notifications in chunks of 100
Dispatch Graphite notifications in chunks of 100

BUG=skia:
R=bensong@google.com, jcgregorio@google.com, rmistry@google.com

Author: kelvinly@google.com

Review URL: https://codereview.chromium.org/334013006

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