Automatically recognize XSRF protection cookies, and set a corresponding XSRF
header. Allows applications to configure the cookie names, or if needed,
completely override the XSRF request configuration by binding their own
XSRFHandler implementation.
Part of #8511.
allows for
```
bootstrap(App, [
...HTTP_PROVIDERS,
...ROUTER_PROVIDERS
])
.then(enableDebugTools)
```
without breaking the rule of always returning a value in a promise
This is based on Angular 1's implementation, parsing an HTML document
into an inert DOM Document implementation, and then serializing only
specifically whitelisted elements.
It currently does not support SVG sanitization, all SVG elements are
rejected.
If available, the sanitizer uses the `<template>` HTML element as an
inert container.
Sanitization works client and server-side.
Reviewers: rjamet, tbosch , molnarg , koto
Differential Revision: https://reviews.angular.io/D108
