Initial repo setup for third party library CED

Initializes src/third_party/ced for CED, open-source library used to
detect texting encoding automatically.

This library is intended to replace ICU used in Blink for
automatic text encoding detection feature. The feature,
when enabled, helps web pages coming without encoding label
displayed as expected instead of showing gibberish.

The feature is disabled by default despite its usefulness,
since it slows down the page loading for those unlabeled ones
(about 2% of total pages) down to 20~30% in some cases. It is
left to users to turn it on via UI.

CED is used extensively in Google, and is a better
alternative in terms of accuracy, speed, size, etc.
Experiments show that CED introduces no significant load.
With CED in place, it is possible that automatic encoding
detection can be turned on by default without introducing
regression in page loading time. This will be particularly
beneficial on mobile platform like Android where UI has more
limitations. It will just work without individual users
having to turn it on.

BUG=597488

Review-Url: https://codereview.chromium.org/2047993002
Cr-Commit-Position: refs/heads/master@{#400906}
7 files changed