MediaMetrics: Add const correctness for items in service

Allows multithreaded use of items without lock.

Test: mediametrics dumpsys, atest mediametrics_tests
Bug: 138583596
Change-Id: Ieb901076b9acc33a89737b320a4fc8ce82f2608d
diff --git a/services/mediaanalytics/statsd_drm.cpp b/services/mediaanalytics/statsd_drm.cpp
index 845383d..5c81ebf 100644
--- a/services/mediaanalytics/statsd_drm.cpp
+++ b/services/mediaanalytics/statsd_drm.cpp
@@ -38,7 +38,7 @@
 namespace android {
 
 // mediadrm
-bool statsd_mediadrm(MediaAnalyticsItem *item)
+bool statsd_mediadrm(const MediaAnalyticsItem *item)
 {
     if (item == NULL) return false;
 
@@ -75,7 +75,7 @@
 }
 
 // widevineCDM
-bool statsd_widevineCDM(MediaAnalyticsItem *item)
+bool statsd_widevineCDM(const MediaAnalyticsItem *item)
 {
     if (item == NULL) return false;
 
@@ -105,7 +105,7 @@
 }
 
 // drmmanager
-bool statsd_drmmanager(MediaAnalyticsItem *item)
+bool statsd_drmmanager(const MediaAnalyticsItem *item)
 {
     if (item == NULL) return false;