Add Oemcrypto build information to metrics.

Import from http://go/wvgerrit/68385

Adds the build information returned from OEMCrypto_BuildInformation()
to the CDM session metrics.

Bug: 117117555
Test: Unit tests. GPlay manual. GTS Tests.
Change-Id: I505c46fec61a7c62538f843185ec0358f860da79

libwvdrmengine/mediadrm/src_hidl/hidl_metrics_adapter.cpp

@@ -397,6 +397,11 @@ void HidlMetricsAdapter::AddSessionMetrics(
   group_builder.AddDistributions(
       "cdm_session_license_request_latency_ms",
       proto_metrics.cdm_session_license_request_latency_ms());
+  if (proto_metrics.has_oemcrypto_build_info()) {
+    group_builder.AddValue(
+        "oemcrypto_build_info",
+        proto_metrics.oemcrypto_build_info());
+  }
   group_vector_.emplace_back(group_builder.Build());
 }