system_api: add anomaly event service interface This also adds new event types to the metrics event protobuf, and adds generation of C++ sources for use by the anomaly collector. BUG=chromium:729335 TEST=compiles, links, and runs with anomaly_collector Change-Id: I330d9103752c9db58c6db824f69e25d5cc6bd180 Reviewed-on: https://chromium-review.googlesource.com/1239736 Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com> Tested-by: Luigi Semenzato <semenzato@chromium.org> Reviewed-by: Luigi Semenzato <semenzato@chromium.org> 
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