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_session_key_table.h

@@ -0,0 +1,45 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+//  Mock implementation of OEMCrypto APIs
+//
+#ifndef MOCK_OEMCRYPTO_SESSION_KEY_TABLE_H_
+#define MOCK_OEMCRYPTO_SESSION_KEY_TABLE_H_
+
+#include <stdint.h>
+#include <map>
+#include <vector>
+
+#include "oemcrypto_key_mock.h"
+#include "wv_cdm_types.h"
+
+namespace wvoec_mock {
+
+class SessionContext;
+class CryptoEngine;
+class UsageTable;
+class UsageTableEntry;
+
+typedef std::vector<uint8_t>  KeyId;
+typedef std::map<KeyId, Key*> KeyMap;
+
+// SessionKeyTable holds the keys for the current session
+class SessionKeyTable {
+ public:
+  SessionKeyTable() {}
+  ~SessionKeyTable();
+
+  bool Insert(const KeyId key_id, const Key& key_data);
+  Key* Find(const KeyId key_id);
+  void Remove(const KeyId key_id);
+  void UpdateDuration(const KeyControlBlock& control);
+  size_t size() const { return keys_.size(); }
+
+ private:
+  KeyMap keys_;
+
+  CORE_DISALLOW_COPY_AND_ASSIGN(SessionKeyTable);
+};
+
+}  // namespace wvoec_mock
+
+#endif  // MOCK_OEMCRYPTO_SESSION_KEY_TABLE_H_