Merge oemcrypto fuzz tests to sc-widevine-release branch

Merge from Widevine repo of http://go/wvgerrit/131308

These tests will be released on the sc-widevine-release branch, but
not as part of the initial Android S release.

Change-Id: I6dae85fe72c6d09759e43c5e40bbc0776b57b089

libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h

@@ -379,6 +379,7 @@ typedef struct {
 typedef enum OEMCrypto_Algorithm {
   OEMCrypto_AES_CBC_128_NO_PADDING = 0,
   OEMCrypto_HMAC_SHA256 = 1,
+  OEMCrypto_Algorithm_MaxValue = 1,
 } OEMCrypto_Algorithm;
 
 /// @}