Allow a service certificate to be specified for provisioning

[ Merge of http://go/wvgerrit/48400 ]

Client identification information has recently been enabled in
provisioning messages. For privacy concerns this information
is being encrypted with a default service certificate.
Apps need to be able to override the default one to allow
for provisioning with third party provisioning services.

Bug: 78420508
Test: WV unit, integration tests
      New WvCdmRequestLicenseTest.ProvisioningTestWithServiceCertificate test
      GTS MediaDrmTestCases

Change-Id: Iee61ad47d33ce011efbea4eb90f7e4b1f032d15f

libwvdrmengine/cdm/test/cdm_feature_test.cpp

@@ -54,6 +54,7 @@ const int kHttpOk = 200;
 // The following two responses are unused, but left here for human debuggers.
 // const int kHttpBadRequest = 400;
 // const int kHttpInternalServerError = 500;
+const std::string kEmptyServiceCertificate;
 
 // Default license server, can be configured using --server command line option
 // Default key id (pssh), can be configured using --keyid command line option
@@ -418,7 +419,9 @@ TEST_F(WvCdmFeatureTest, OEMCertificateProvisioning) {
 
   EXPECT_EQ(wvcdm::NO_ERROR,
             decryptor_.GetProvisioningRequest(cert_type, cert_authority,
-                                              kDefaultCdmIdentifier, &key_msg_,
+                                              kDefaultCdmIdentifier,
+                                              kEmptyServiceCertificate,
+                                              &key_msg_,
                                               &provisioning_server_url));
   EXPECT_EQ(provisioning_server_url, g_config->provisioning_server());
 
@@ -453,7 +456,9 @@ TEST_F(WvCdmFeatureTest, KeyboxProvisioning) {
 
   EXPECT_EQ(wvcdm::NO_ERROR,
             decryptor_.GetProvisioningRequest(cert_type, cert_authority,
-                                              kDefaultCdmIdentifier, &key_msg_,
+                                              kDefaultCdmIdentifier,
+                                              kEmptyServiceCertificate,
+                                              &key_msg_,
                                               &provisioning_server_url));
   EXPECT_EQ(provisioning_server_url, g_config->provisioning_server());