Implement tests for CSP mode for JS and Dart

[tbosch]

E.g. we do eval in browser_adapter.dart for performance reasons, and need to switch it to a slower version using JsObject instead.

[mhevery]

@IgorMinar may have an opinion as he has done this before.

[IgorMinar]

we'll need a special mode for the server that sends the right http headers to turn on the CSP mode.

this is what we did in v1: https://github.com/angular/angular.js/blob/master/lib/grunt/utils.js#L271-L283

[splincode]

@mhevery @IgorMinar Is the issue relevant?

[mhevery]

no longer relevant

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