OEMCrypto v16.2

Merge from Widevine repo of http://go/wvgerrit/93404

This is the unit tests, reference code, and documentation for
OEMCrypto v16.2. Backwards compatibility should work for a v15
OEMCrypto.

Some review comments will be addressed in future CLs.

Bug: 141247171
Test: Unit tests
Test: Media GTS tests on bonito
Change-Id: I9d427c07580e180c0a4cfdc4a68f538d351c0ddd

libwvdrmengine/oemcrypto/test/common.mk

@@ -5,6 +5,9 @@ ifeq ($(filter mips mips64, $(TARGET_ARCH)),)
 LOCAL_LDFLAGS+=-Wl,--hash-style=both
 endif
 
+# The unit tests can access v15 functions through the dynamic adapter:
+LOCAL_CFLAGS += -DTEST_OEMCRYPTO_V15
+
 LOCAL_SRC_FILES:= \
   oec_device_features.cpp \
   oec_decrypt_fallback_chain.cpp \
@@ -43,6 +46,7 @@ LOCAL_SHARED_LIBRARIES := \
   libdl \
   liblog \
   libmedia_omx \
+  libprotobuf-cpp-lite \
   libstagefright_foundation \
   libutils \
   libz \