File util, generic crypto, and key query

This CL merges several CLs from the widevine repo:

http://go/wvgerrit/18012 Add support for querying allowed usage for key.
http://go/wvgerrit/17971 Add per-origin storage.
http://go/wvgerrit/18152 Add OEMCrypto's generic crypto operations to CDM.
http://go/wvgerrit/17911 QueryKeyControlInfo => QueryOemCryptoSessionId

Note: numbering in wv_cdm_types.h was added in this CL and will be
back ported to wvgerrit in a future CL.

Change-Id: Idb9e9a67e94f62f25dc16c5307f75a08b3430b64

libwvdrmengine/cdm/core/include/certificate_provisioning.h

@@ -12,6 +12,7 @@
 namespace wvcdm {
 
 class CdmSession;
+class FileSystem;
 
 class CertificateProvisioning {
  public:
@@ -26,7 +27,7 @@ class CertificateProvisioning {
                                          CdmProvisioningRequest* request,
                                          std::string* default_url);
   CdmResponseType HandleProvisioningResponse(
-      const std::string& origin,
+      FileSystem* file_system,
       const CdmProvisioningResponse& response,
       std::string* cert,
       std::string* wrapped_key);