Initial commit to add a tab to include all fonts used in the webpage in the web inspector.
Pull request: https://github.com/WebKit/WebKit/pull/16650
Pull request: https://github.com/WebKit/WebKit/pull/16651
<rdar://problem/114164204>
*** Bug 260071 has been marked as a duplicate of this bug. ***
Pull request: https://github.com/WebKit/WebKit/pull/29525