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/cdm/metrics/src/metrics.proto

@@ -157,7 +157,7 @@ message WvCdmMetrics {
 
   // This contains metrics that were captured within a CdmSession. This contains
   // nested CryptoMetrics that were captured in the context of the session.
-  // next id: 8
+  // next id: 9
   message SessionMetrics {
     optional ValueMetric session_id = 1;
     optional CryptoMetrics crypto_metrics = 2;
@@ -166,6 +166,7 @@ message WvCdmMetrics {
     repeated CounterMetric cdm_session_restore_offline_session = 5;
     repeated CounterMetric cdm_session_restore_usage_session = 6;
     repeated DistributionMetric cdm_session_license_request_latency_ms = 7;
+    optional ValueMetric oemcrypto_build_info = 8;
   }
 
   // These are metrics recorded at the Engine level. This includes CryptoSession

libwvdrmengine/cdm/metrics/src/metrics_collections.cpp

@@ -177,6 +177,8 @@ void SessionMetrics::SerializeSessionMetrics(
       session_metrics->mutable_cdm_session_restore_usage_session());
   cdm_session_license_request_latency_ms_.ToProto(
       session_metrics->mutable_cdm_session_license_request_latency_ms());
+  session_metrics->set_allocated_oemcrypto_build_info(
+      oemcrypto_build_info_.ToProto());
 }
 
 OemCryptoDynamicAdapterMetrics::OemCryptoDynamicAdapterMetrics()