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/media/libmediaplayerservice/nuplayer/NuPlayerDriver.cpp b/media/libmediaplayerservice/nuplayer/NuPlayerDriver.cpp
index 2b813e7..865cb2a 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerDriver.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerDriver.cpp
@@ -635,7 +635,7 @@
 
         // re-init in case we prepare() and start() again.
         delete mAnalyticsItem ;
-        mAnalyticsItem = MediaAnalyticsItem::create("nuplayer");
+        mAnalyticsItem = MediaAnalyticsItem::create(kKeyPlayer);
         if (mAnalyticsItem) {
             mAnalyticsItem->setUid(mClientUid);
         }