[webkit-gtk] Performance timeline and resource timing API's

[Jose Dapena Paz]

ts.

These days I'm starting to work on enabling more web application
profiling APIs on Gtk ports.

In particular, my idea is adding support for building with
PERFORMANCE_TIMELINE and RESOURCE_TIMING, so that we are ready once the
resource timing implementation in WebCore fills the performance timeline
with actual information.

I think it shouldn't have anything specific to Gtk port, so just only
the settings to enable it and export its JS interfaces.

Task in bugzilla:
https://bugs.webkit.org/show_bug.cgi?id=96107

Br,