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This adds a getter and setter to enable and disable brotli. The test
tests that brotli is advertised (or not) and that encoded data can be
decoded correctly.

Bug = 737231

Bug: 737231
Change-Id: I63e58f97725764b74f51a86edc2ed0eefafe7476
Reviewed-on: https://chromium-review.googlesource.com/563857
Commit-Queue: Brad Lassey <lassey@chromium.org>
Reviewed-by: smut <smut@google.com>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485262}