OEMCrypto v14 Unit tests and reference code

Merge from Widevine repo of http://go/wvgerrit/41661

bug: 64001862 OEMCrypto V14 for Android P

test: Unit tests pass
Change-Id: I3314a881357c12ef63d7b257d83f6f0d07e4725a

libwvdrmengine/cdm/core/test/generic_crypto_unittest.cpp

@@ -16,6 +16,7 @@
 #include "log.h"
 #include "oec_session_util.h"
 #include "../../oemcrypto/mock/src/oemcrypto_key_mock.h"
+#include "oemcrypto_session_tests_helper.h"
 #include "properties.h"
 #include "string_conversions.h"
 #include "url_request.h"
@@ -34,7 +35,8 @@ std::string g_provisioning_service_certificate;
 
 namespace wvcdm {
 
-class WvGenericOperationsTest : public testing::Test {
+class WvGenericOperationsTest : public testing::Test,
+                                public wvoec::SessionUtil {
  public:
   WvGenericOperationsTest() : crypto_session_(NULL) {}
 
@@ -49,10 +51,8 @@ class WvGenericOperationsTest : public testing::Test {
     g_license_service_certificate.assign(config.license_service_certificate());
     g_provisioning_server.assign(config.provisioning_server());
 
-    // TODO(fredgc or gmorgan): This should be updated for provisioning 3.0
-    // Load test keybox. This keybox will be used by any CryptoSession
-    // created by the CDM under test.
-    ASSERT_EQ(OEMCrypto_SUCCESS, OEMCrypto_LoadTestKeybox());
+    // Ensure that OEMCrypto has a test keybox if needed.
+    EnsureTestKeys();
 
     // Perform CdmEngine setup
     cdm_engine_.reset(new CdmEngine(&file_system_));