Add fuzz tests for deserialzing fuzzed data

The existing tests in this fuzzer take fuzzed data,
serialize it into something, then deserialize the
result. These new tests take the fuzzed data and
pass it directly to the deserializing code.

Bug: 170243740
Test: Builds and runs
Change-Id: I0a7a3a8230b545feaef46628b8a1883b8e32f27a