OEMCrypto v14 Unit tests and reference code

Merge from Widevine repo of http://go/wvgerrit/41661

bug: 64001862 OEMCrypto V14 for Android P

test: Unit tests pass
Change-Id: I3314a881357c12ef63d7b257d83f6f0d07e4725a

libwvdrmengine/oemcrypto/test/oec_device_features.cpp

@@ -138,6 +138,7 @@ std::string DeviceFeatures::RestrictFilter(const std::string& initial_filter) {
   if (api_version < 11)               FilterOut(&filter, "*API11*");
   if (api_version < 12)               FilterOut(&filter, "*API12*");
   if (api_version < 13)               FilterOut(&filter, "*API13*");
+  if (api_version < 14)               FilterOut(&filter, "*API14*");
   // Performance tests take a long time.  Filter them out if they are not
   // specifically requested.
   if (filter.find("Performance") == std::string::npos) {