Update LoadTestKeybox

Merge from Widevine repo of http://go/wvgerrit/41662

This CL updates oemcrypto unit tests to use the new test keybox.

bug: 69552641 Update OEMCrypto_LoadTestKeybox

test: Unit tests compile and run -- many tests won't pass until merged
with vendor code

Change-Id: I73bdca3958b2c985d4c61801aa95807a2e6d4299

libwvdrmengine/oemcrypto/mock/src/oemcrypto_auth_mock.h

@@ -49,7 +49,10 @@ class AuthenticationRoot {
   }
 
   WvKeybox& keybox() { return use_test_keybox_ ? test_keybox_ : keybox_; }
-  void UseTestKeybox() { use_test_keybox_ = true; }
+  bool UseTestKeybox(const uint8_t* keybox_data, size_t keybox_length) {
+    use_test_keybox_ = true;
+    return test_keybox_.InstallKeybox(keybox_data, keybox_length);
+  }
 
   RSA_shared_ptr& SharedRsaKey() { return rsa_key_; }
   RSA* rsa_key() { return rsa_key_.get(); }