Generate golden data tests for ODK

Generate core message request and responses for
golden data tests.

This CL does not have any golden data. The golden data
will be added to a google3 CL.

To turn on dumping of golden data, set the environment
variable DUMP_GOLDEN_DATA to "yes".

Merged from https://widevine-internal-review.googlesource.com/171750

Change-Id: I7ae2d76ec7330d9131aae98dfd07b7909d10f726

libwvdrmengine/cdm/test/integration-test.mk

@@ -20,6 +20,7 @@ LOCAL_SRC_FILES := \
     ../core/test/http_socket.cpp \
     ../core/test/license_holder.cpp \
     ../core/test/license_request.cpp \
+    ../core/test/message_dumper.cpp \
     ../core/test/provisioning_holder.cpp \
     ../core/test/test_base.cpp \
     ../core/test/test_printers.cpp \