[FYI +blink-dev]

ES6 extends String.prototype with several methods: repeat, startsWith,
endsWith, includes, codePointAt) and adds String.fromCodePoint method.

Firefox ships codePointAt and fromCodePoint since release 29 [1],
startsWith and endsWith since release 17 [2], and repeat since release 24
[3].

'include' was previously named 'contains' and has been renamed at the last
TC39 meeting. Firefox shipped 'contains' since release 17.

These methods has been available under a flag for a while, and were staged
in Chrome 40.

[1] https://developer.mozilla.org/en-US/Firefox/Releases/29
[2] https://developer.mozilla.org/en-US/Firefox/Releases/17
[3] https://developer.mozilla.org/en-US/Firefox/Releases/24

Owners: yang...@chromium.org, dslo...@chromium.org

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