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Implement compression for "gzip" and "deflate". That implementation is
hidden behing ExperimentalCompressionStream flag.

For unit tests, we compress and stream and uncompress it with pako, and
we make sure its output is the same as our original data.

Change-Id: I89dde0e06a07b695be93a3b4f81fa6b3ee80d760
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763344
Commit-Queue: Adam Rice <ricea@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704009}