Add API for device provisioning server certificate

[ Merge of http://go/wvgerrit/20205/ ]

This is separate from the server certificate used for license
requests.

b/34211823

Test: Reran unittests. All tests other than some oemcrypto,
request_license_test passed. Those tests failed with or without this CL.

Change-Id: I23abdf276f8d3db9222f014175d0bb5094010a04

libwvdrmengine/cdm/core/src/properties.cpp

@@ -80,6 +80,28 @@ bool Properties::SetServiceCertificate(const CdmSessionId& session_id,
   return true;
 }
 
+bool Properties::GetDeviceProvisioningServiceCertificate(
+    const CdmSessionId& session_id, std::string* service_certificate) {
+  const CdmClientPropertySet* property_set =
+      GetCdmClientPropertySet(session_id);
+  if (NULL == property_set) {
+    return false;
+  }
+  *service_certificate = property_set->device_provisioning_service_certificate();
+  return true;
+}
+
+bool Properties::SetDeviceProvisioningServiceCertificate(
+      const CdmSessionId& session_id, const std::string& service_certificate) {
+  CdmClientPropertySet* property_set =
+      GetCdmClientPropertySet(session_id);
+  if (NULL == property_set) {
+    return false;
+  }
+  property_set->set_device_provisioning_service_certificate(service_certificate);
+  return true;
+}
+
 bool Properties::UsePrivacyMode(const CdmSessionId& session_id) {
   const CdmClientPropertySet* property_set =
       GetCdmClientPropertySet(session_id);