Polyfills Strings.prototype.codePointAt if not present in the browser.
Polyfills Strings.prototype.codePointAt if not present in the browser.

Change-Id: I942f1e23050bd629417530049f0358fd81760994
Reviewed-on: https://chromium-review.googlesource.com/285559
Reviewed-by: Rob Ginda <4419ac4e35d191308e944202d542b192188656d1@chromium.org>
Tested-by: Rob Ginda <4419ac4e35d191308e944202d542b192188656d1@chromium.org>

hernad/libapps,hernad/libapps,hernad/libapps,hernad/libapps