OEMCrypto Tests Provisioning Method

Merge from widevine repo of http://go/wvgerrit/21682

This CL updates oemcrypto/test/oec_device_features.cpp to figure out
the provisioning method and filter out tests that are not relevant to
the device's method.

This CL also introduces unit tests for GetOEMPublicCertificate.

Unit tests for RewrapDeviceRSAKey30 will be in a future CL.

Change-Id: Ib7065ce866d1171ca61b9aa08188fa2ac8d90fc2

libwvdrmengine/oemcrypto/test/oec_device_features.h

@@ -16,6 +16,7 @@ class DeviceFeatures {
     LOAD_TEST_RSA_KEY,     // Call LoadTestRSAKey before deriving keys.
     EXISTING_TEST_KEYBOX,  // Keybox is already the test keybox.
     FORCE_TEST_KEYBOX,     // User requested calling InstallKeybox.
+    TEST_PROVISION_30,     // Device has OEM Certificate installed.
   };
 
   enum DeriveMethod derive_key_method;
@@ -26,6 +27,7 @@ class DeviceFeatures {
   bool cast_receiver;      // Device supports alternate rsa signature padding.
   bool usage_table;        // Device saves usage information.
   uint32_t api_version;
+  OEMCrypto_ProvisioningMethod provisioning_method;
 
   void Initialize(bool is_cast_receiver, bool force_load_test_keybox);
   std::string RestrictFilter(const std::string& initial_filter);
@@ -37,6 +39,7 @@ class DeviceFeatures {
 };
 
 extern DeviceFeatures global_features;
+const char* ProvisioningMethodName(OEMCrypto_ProvisioningMethod method);
 
 }  // namespace wvoec