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/src/license_protocol.proto

@@ -461,7 +461,7 @@ message EncryptedClientIdentification {
   optional bytes encrypted_client_id = 3;
   // Initialization vector needed to decrypt encrypted_client_id.
   optional bytes encrypted_client_id_iv = 4;
-  // AES-128 privacy key, encrytped with the service public public key using
+  // AES-128 privacy key, encrypted with the service public public key using
   // RSA-OAEP.
   optional bytes encrypted_privacy_key = 5;
 }