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/oemcrypto/mock/src/oemcrypto_engine_mock.h

@@ -12,6 +12,7 @@
 
 #include <openssl/rsa.h>
 
+#include "file_store.h"
 #include "lock.h"
 #include "oemcrypto_key_mock.h"
 #include "oemcrypto_keybox_mock.h"
@@ -231,7 +232,7 @@ class SessionContext {
 
 class CryptoEngine {
  public:
-  CryptoEngine();
+  CryptoEngine(wvcdm::FileSystem* file_system);
   ~CryptoEngine();
 
   bool Initialized() { return true; }
@@ -267,6 +268,7 @@ class CryptoEngine {
   OEMCrypto_HDCP_Capability maximum_hdcp_capability();
 
   UsageTable* usage_table() { return usage_table_; }
+  wvcdm::FileSystem* file_system() { return file_system_; }
   bool local_display();
   bool closed_platform();
   bool supports_storage();
@@ -284,6 +286,7 @@ class CryptoEngine {
   WvTestKeybox test_keybox_;
   bool use_test_keybox_;
   wvcdm::Lock session_table_lock_;
+  wvcdm::FileSystem* file_system_;
   UsageTable* usage_table_;
   RSA* rsa_key_;  // If no keybox, this is baked in certificate.