Refactor OEMCrypto Engine

Merge from widevine repo of http://go/wvgerrit/23280

This CL moves some of the oemcrypto mock classes into their own
files.  There are no real code changes.

Change-Id: I4e4a6a01d8e75051bc0eb2a5d58361c438c7f41b

libwvdrmengine/oemcrypto/mock/src/oemcrypto_nonce_table.h

@@ -0,0 +1,38 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+//  Mock implementation of OEMCrypto APIs
+//
+#ifndef MOCK_OEMCRYPTO_NONCE_TABLE_H_
+#define MOCK_OEMCRYPTO_NONCE_TABLE_H_
+
+#include <stdint.h>
+
+namespace wvoec_mock {
+
+class NonceTable {
+ public:
+  static const int kTableSize = 16;
+  NonceTable() {
+    for (int i = 0; i < kTableSize; ++i) {
+      state_[i] = kNTStateInvalid;
+    }
+  }
+  ~NonceTable() {}
+  void AddNonce(uint32_t nonce);
+  bool CheckNonce(uint32_t nonce);
+  void Flush();
+
+ private:
+  enum NonceTableState {
+    kNTStateInvalid,
+    kNTStateValid,
+    kNTStateFlushPending
+  };
+  NonceTableState state_[kTableSize];
+  uint32_t age_[kTableSize];
+  uint32_t nonces_[kTableSize];
+};
+
+}  // namespace wvoec_mock
+
+#endif  // MOCK_OEMCRYPTO_NONCE_TABLE_H_