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The libipp is a new library to parse & build IPP frames.
IPP = Internet Printing Protocol.

BUG=chromium:902085
TEST=on local chrome build

Change-Id: I2952870b332cc1ce456eb418bc1f8e5104fc6364
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769161Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Piotr Pawliczek <pawliczek@chromium.org>
Auto-Submit: Piotr Pawliczek <pawliczek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690771}