Add benchmarks for writing to a FileOutputStream.  Patch from Evan Jones.
Add benchmarks for writing to a FileOutputStream.  Patch from Evan Jones.

nilavghosh/Protocol-Buffers-Fork,nilavghosh/Protocol-Buffers-Fork,nilavghosh/Protocol-Buffers-Fork,nilavghosh/Protocol-Buffers-Fork,nilavghosh/Protocol-Buffers-Fork