Initial import of Widevine Common Encryption DRM engine

Builds libwvmdrmengine.so, which is loaded by the new
MediaDrm APIs to support playback of Widevine/CENC
protected content.

Change-Id: I6f57dd37083dfd96c402cb9dd137c7d74edc8f1c

libwvdrmengine/level3/arm/string_conversions.h

@@ -0,0 +1,18 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+
+#ifndef OEMCRYPTO_STRING_CONVERSIONS_H_
+#define OEMCRYPTO_STRING_CONVERSIONS_H_
+
+#include <string>
+#include <vector>
+
+namespace wvcdm {
+
+std::vector<uint8_t> a2b_hex(const std::string& b);
+std::string b2a_hex(const std::vector<uint8_t>& b);
+std::string HexEncode(const uint8_t* bytes, unsigned size);
+std::string IntToString(int value);
+
+};  // namespace wvcdm
+
+#endif  // OEMCRYPTO_STRING_CONVERSIONS_H_