Fix backwards compatibility

Merge from Widevine repo of http://go/wvgerrit/42403

This CL changes the names of some unit tests so that they don't run
when testing an older version of oemcrypto.

bug: 68275290
test: ran unit tests against v8-v14 oemcrypto.
Change-Id: I773350adf4df3f3b310478400cd4d4e85789fc37

libwvdrmengine/oemcrypto/test/oemcrypto_session_tests_helper.cpp

@@ -104,10 +104,10 @@ void SessionUtil::EnsureTestKeys() {
     case DeviceFeatures::LOAD_TEST_KEYBOX:
       keybox_ = kTestKeybox;
       /* Note: If you are upgrading from an older version, it may be easier to
-       * uncomment the following line.  This uses the same test keybox as we
+       * force the following condition.  This uses the same test keybox as we
        * used in older versions of this test.
       */
-      // keybox_ = kValidKeybox01;
+      if (global_features.api_version < 14) keybox_ = kValidKeybox01;
       ASSERT_EQ(OEMCrypto_SUCCESS,
                 OEMCrypto_LoadTestKeybox(
                     reinterpret_cast<const uint8_t*>(&keybox_),
@@ -117,8 +117,8 @@ void SessionUtil::EnsureTestKeys() {
       ASSERT_EQ(OEMCrypto_SUCCESS, OEMCrypto_LoadTestRSAKey());
       break;
     case DeviceFeatures::EXISTING_TEST_KEYBOX:
-      // already has test keybox.
-      keybox_ = kTestKeybox;
+      // already has old test keybox.
+      keybox_ = kValidKeybox01;
       break;
     case DeviceFeatures::FORCE_TEST_KEYBOX:
       keybox_ = kTestKeybox;