connect mediametrics service to statsd

take the collected media.metrics (as they arrive) and push a copy over
to statsd, the statistics logging subsystem.
gather data, wrap in protobufs apppropriately, and submit it to statsd.

Bug: 118782504
Test: statsd's test_drive app
Change-Id: Ieb82c43633851075e9eaf65d2a95c8cba87441ea
diff --git a/services/mediaanalytics/MediaAnalyticsService.h b/services/mediaanalytics/MediaAnalyticsService.h
index 632c692..6c9cbaa 100644
--- a/services/mediaanalytics/MediaAnalyticsService.h
+++ b/services/mediaanalytics/MediaAnalyticsService.h
@@ -112,6 +112,9 @@
 
 };
 
+// hook to send things off to the statsd subsystem
+extern bool dump2Statsd(MediaAnalyticsItem *item);
+
 // ----------------------------------------------------------------------------
 
 }; // namespace android