Add a static method to query security level

[ Merge of http://go/wvgerrit/70665 ]

This allows one to be able to query for security level, from
Crypto factory methods before the plugins and CdmEngine objects
have been created.

Bug: 117104043
Test: WV Unit/integration tests
Change-Id: Id07f420c3cfb92166cd3bb3cf82148d52e10eb03

libwvdrmengine/cdm/core/include/cdm_engine.h

@@ -151,6 +151,9 @@ class CdmEngine {
   virtual CdmResponseType QueryKeyStatus(const CdmSessionId& session_id,
                                          CdmQueryMap* query_response);
 
+  // Query security level support
+  static bool IsSecurityLevelSupported(CdmSecurityLevel level);
+
   // Query the types of usage permitted for the specified key.
   virtual CdmResponseType QueryKeyAllowedUsage(const CdmSessionId& session_id,
                                                const std::string& key_id,