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This adds MerkleIntegritySourceStream class which decodes and validates
the "mi-sha256" content encoding [1]. This class will be used by
WebPackageLoader to verify integrity of message body.

[1] https://tools.ietf.org/html/draft-thomson-http-mice-02

Bug: 803774
Change-Id: I62353f594e30e90fa982a68374389267b39c21fe
Reviewed-on: https://chromium-review.googlesource.com/892844
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533203}