[kernel] Add pkg/kernel/test/binary_bench.dart.
[kernel] Add pkg/kernel/test/binary_bench.dart.

This file implements a simple benchmark for kernel serialization and
deserialization routines.

Change-Id: Ib67745a4176c2bcf5717395af86d724ffbb164fd
Reviewed-on: https://dart-review.googlesource.com/18185
Commit-Queue: Vyacheslav Egorov <72c81f38df725d8f1832acb9b5bb99563fc2f1b9@google.com>
Reviewed-by: Jens Johansen <05223a3c6bdf76af6f84755eae231abeebcf4530@google.com>

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