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_engine_device_properties_cert.cpp

@@ -0,0 +1,37 @@
+// 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
+//
+//  This file contains oemcrypto engine properties that would be for a device
+//  that does not have persistant storage or a keybox.
+//
+//  Note: We also define it to be L2 for illustration only.  Production devices
+//  are rarely level 2.
+#include "oemcrypto_engine_ref.h"
+
+namespace wvoec_ref {
+
+class CertOnlyCryptoEngine : public CryptoEngine {
+ public:
+  explicit CertOnlyCryptoEngine(scoped_ptr<wvcdm::FileSystem> file_system)
+      : CryptoEngine(file_system) {}
+
+  bool config_local_display_only() { return true; }
+
+  bool config_supports_usage_table() { return false; }
+
+  OEMCrypto_ProvisioningMethod config_provisioning_method() {
+    return OEMCrypto_DrmCertificate;
+  }
+
+  const char* config_security_level() { return "L2"; }
+};
+
+CryptoEngine* CryptoEngine::MakeCryptoEngine(
+    scoped_ptr<wvcdm::FileSystem> file_system) {
+  return new CertOnlyCryptoEngine(file_system);
+}
+
+}  // namespace wvoec_ref