Widevine Metrics System

This change is the complete Widevine metrics system. It will
measure and record runtime information about what is happening
in the CDM - such as errors and throughput.

Bug: 33745339
Bug: 26027857
Change-Id: Ic9a82074f1e2b72c72d751b235f8ae361232787d

libwvdrmengine/cdm/core/include/certificate_provisioning.h

@@ -6,6 +6,7 @@
 #include <string>
 
 #include "crypto_session.h"
+#include "metrics_group.h"
 #include "oemcrypto_adapter.h"
 #include "service_certificate.h"
 #include "wv_cdm_types.h"
@@ -17,7 +18,8 @@ class FileSystem;
 
 class CertificateProvisioning {
  public:
-  CertificateProvisioning() :
+  CertificateProvisioning(metrics::MetricsGroup* metrics) :
+      crypto_session_(metrics),
       cert_type_(kCertificateWidevine),
       service_certificate_(NULL) {};
   ~CertificateProvisioning() {};