Refactor oemcrypto mock into stand alone reference code

Merge from Widevine repo of http://go/wvgerrit/46204
Refactor utility code - split the mock, step 1

Merge from Widevine repo of http://go/wvgerrit/46205
Move some OEMCrypto types to common header - split the mock, step 2

Merge from Widevine repo of http://go/wvgerrit/46206
Split mock into two -- step 3

Merge from Widevine repo of http://go/wvgerrit/47460
Split the mock into two -- step 3.5

The CL moves several files used by oemcrypto and cdm into a common
subdirectory, so that it may more easily be shared with partners.

The CORE_DISALLOW_COPY_AND_ASSIGN macro was moved to its own header in
the util/include directory.

This CL removes some references to the mock from other code, and puts
some constants and types, such as the definition of the keybox, into a
header in oemcrypto.

Test: tested as part of http://go/ag/4674759
bug: 76393338
Change-Id: I75b4bde7062ed8ee572c97ebc2f4da018f4be0c9

libwvdrmengine/oemcrypto/ref/src/oemcrypto_rsa_key_shared.h

@@ -0,0 +1,42 @@
+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine Master
+// License Agreement.
+//
+//  Ref implementation of OEMCrypto APIs
+//
+#ifndef OEMCRYPTO_RSA_KEY_SHARED_H_
+#define OEMCRYPTO_RSA_KEY_SHARED_H_
+
+#include <stdint.h>
+
+#include <openssl/rsa.h>
+
+namespace wvoec_ref {
+
+// Shared pointer with specialized destructor.  This pointer is only shared
+// from a CryptoEngine to a Session -- so we don't have to use full reference
+// counting.
+class RSA_shared_ptr {
+ public:
+  RSA_shared_ptr() : rsa_key_(NULL), key_owned_(false) {}
+  ~RSA_shared_ptr() { reset(); };
+  // Explicitly allow copy as share.
+  explicit RSA_shared_ptr(const RSA_shared_ptr& other) :
+      rsa_key_(other.rsa_key_), key_owned_(false) {}
+  RSA* get() { return rsa_key_; }
+  void reset();
+  bool LoadPkcs8RsaKey(const uint8_t* buffer, size_t length);
+
+ private:
+  void operator=(const RSA_shared_ptr);  // disallow assign.
+
+  RSA* rsa_key_;
+  bool key_owned_;
+};
+
+// Log errors from BoringSSL.
+void dump_boringssl_error();
+
+}  // namespace wvoec_ref
+
+#endif  // OEMCRYPTO_RSA_KEY_SHARED_H_