Add a field indicating online vs offline licenses.

Import of http://go/wvgerrit/68188

This adds an attribute to metrics indicating if the license was online
or offline.

Also, added a unit test for CdmEngineMetricsImpl.

Test: Unit tests. GPlay manual. GTS tests.
Bug: 115523917

Change-Id: Id315c643048914a2c51904451f9665987bc87eb7

libwvdrmengine/cdm/metrics/include/metrics_collections.h

@@ -85,6 +85,8 @@ const int kEventTypeFieldNumber =
     ::drm_metrics::Attributes::kEventTypeFieldNumber;
 const int kKeyRequestTypeFieldNumber =
     ::drm_metrics::Attributes::kKeyRequestTypeFieldNumber;
+const int kLicenseTypeFieldNumber =
+    ::drm_metrics::Attributes::kLicenseTypeFieldNumber;
 
 }  // anonymous namespace
 
@@ -374,7 +376,8 @@ class EngineMetrics {
   void SetAppPackageName(const std::string &app_package_name);
 
   // Metrics recorded at the engine level.
-  EventMetric<kErrorCodeFieldNumber, CdmResponseType> cdm_engine_add_key_;
+  EventMetric<kErrorCodeFieldNumber, CdmResponseType,
+              kLicenseTypeFieldNumber, CdmLicenseType> cdm_engine_add_key_;
   ValueMetric<std::string> cdm_engine_cdm_version_;
   CounterMetric<kErrorCodeFieldNumber, CdmResponseType>
       cdm_engine_close_session_;
@@ -384,7 +387,8 @@ class EngineMetrics {
       cdm_engine_decrypt_;
   CounterMetric<kErrorCodeBoolFieldNumber, bool>
       cdm_engine_find_session_for_key_;
-  EventMetric<kErrorCodeFieldNumber, CdmResponseType>
+  EventMetric<kErrorCodeFieldNumber, CdmResponseType,
+              kLicenseTypeFieldNumber, CdmLicenseType>
       cdm_engine_generate_key_request_;
   EventMetric<kErrorCodeFieldNumber, CdmResponseType>
       cdm_engine_get_provisioning_request_;