Expose signpost feature through performance.mark

[Constellation]

9b6ae7b7c448c1fe2c63892b5c18f87142909709

Expose signpost feature through performance.mark
https://bugs.webkit.org/show_bug.cgi?id=244793

Reviewed by NOBODY (OOPS!).

This patch adds signpost emission feature to performance.mark. Unfortunately, performance.mark does not include "begin" and "end"
information so we need a way to tell the interval through detail optional JS value.
We add "webkitSignpost" handling, and we carefuly retrieve a value without side effect. So while it does not break standards, still
we offer a way to tell how to emit signpost to WebKit.

    performance.mark("marking#1", { detail: { webkitSignpost: "begin" } });
    ...
    measured code.
    ...
    performance.mark("marking#1", { detail: { webkitSignpost: "end" } });

* Source/WebCore/page/PerformanceMark.cpp:
(WebCore::PerformanceMark::create):

https://github.com/WebKit/WebKit/commit/9b6ae7b7c448c1fe2c63892b5c18f87142909709

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🛠 mac-AS-debug	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 api-mac	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk1
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2
	✅ 🛠 watch	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/6525f351c79f2c3388aa060707049417998634aa)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	⏳ 🛠 ios	⏳ 🛠 mac	~~🛠 wpe~~	~~🛠 🧪 win~~
✅ 🧪 bindings	⏳ 🛠 ios-sim	⏳ 🛠 mac-debug	⏳ 🛠 gtk	⏳ 🛠 wincairo
✅ 🧪 webkitperl	⏳ 🧪 ios-wk2	⏳ 🛠 mac-AS-debug	⏳ 🧪 gtk-wk2
⏳ 🧪 webkitpy	⏳ 🧪 api-ios	⏳ 🧪 api-mac	⏳ 🧪 api-gtk
⏳ 🛠 🧪 jsc	⏳ 🛠 tv	⏳ 🧪 mac-wk1	⏳ 🛠 jsc-armv7
	⏳ 🛠 tv-sim	⏳ 🧪 mac-wk2	⏳ 🧪 jsc-armv7-tests
	⏳ 🛠 watch	⏳ 🧪 mac-AS-debug-wk2
	⏳ 🛠 watch-sim	⏳ 🧪 mac-wk2-stress

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/370a75141296d84c1b131ef4dfae7e95d0c1373b)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
⏳ 🧪 style	⏳ 🛠 ios	⏳ 🛠 mac	⏳ 🛠 wpe	~~🛠 🧪 win~~
⏳ 🧪 bindings	⏳ 🛠 ios-sim	⏳ 🛠 mac-debug	⏳ 🛠 gtk	⏳ 🛠 wincairo
⏳ 🧪 webkitperl	⏳ 🧪 ios-wk2	⏳ 🛠 mac-AS-debug	⏳ 🧪 gtk-wk2
⏳ 🧪 webkitpy	⏳ 🧪 api-ios	⏳ 🧪 api-mac	⏳ 🧪 api-gtk
⏳ 🛠 🧪 jsc	⏳ 🛠 tv	⏳ 🧪 mac-wk1	⏳ 🛠 jsc-armv7
	⏳ 🛠 tv-sim	⏳ 🧪 mac-wk2	⏳ 🧪 jsc-armv7-tests
	⏳ 🛠 watch	⏳ 🧪 mac-AS-debug-wk2
	⏳ 🛠 watch-sim	⏳ 🧪 mac-wk2-stress

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/18a2da1b976f9bec9c756308659a7b58750fedbb)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	⏳ 🛠 ios	⏳ 🛠 mac	⏳ 🛠 wpe	~~🛠 🧪 win~~
⏳ 🧪 bindings	⏳ 🛠 ios-sim	⏳ 🛠 mac-debug	⏳ 🛠 gtk	⏳ 🛠 wincairo
✅ 🧪 webkitperl	⏳ 🧪 ios-wk2	⏳ 🛠 mac-AS-debug	⏳ 🧪 gtk-wk2
	⏳ 🧪 api-ios	⏳ 🧪 api-mac	⏳ 🧪 api-gtk
⏳ 🛠 🧪 jsc	⏳ 🛠 tv	⏳ 🧪 mac-wk1	⏳ 🛠 jsc-armv7
	⏳ 🛠 tv-sim	⏳ 🧪 mac-wk2	⏳ 🧪 jsc-armv7-tests
	⏳ 🛠 watch	⏳ 🧪 mac-AS-debug-wk2
	⏳ 🛠 watch-sim	⏳ 🧪 mac-wk2-stress

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/1bd913285384dc40c3d9b62cd8bbdeec2d597311)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	⏳ 🛠 ios	⏳ 🛠 mac	⏳ 🛠 wpe	⏳ 🛠 🧪 win
✅ 🧪 bindings	⏳ 🛠 ios-sim	⏳ 🛠 mac-debug	⏳ 🛠 gtk	⏳ 🛠 wincairo
✅ 🧪 webkitperl	⏳ 🧪 ios-wk2	⏳ 🛠 mac-AS-debug	⏳ 🧪 gtk-wk2
	⏳ 🧪 api-ios	⏳ 🧪 api-mac	⏳ 🧪 api-gtk
⏳ 🛠 🧪 jsc	⏳ 🛠 tv	⏳ 🧪 mac-wk1	⏳ 🛠 jsc-armv7
	⏳ 🛠 tv-sim	⏳ 🧪 mac-wk2	⏳ 🧪 jsc-armv7-tests
	⏳ 🛠 watch	⏳ 🧪 mac-AS-debug-wk2
	⏳ 🛠 watch-sim	⏳ 🧪 mac-wk2-stress

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/60e1ec7bf2c4506bb7fa1429c3ad3197dc3ef948)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	⏳ 🛠 ios	⏳ 🛠 mac	~~🛠 wpe~~	⏳ 🛠 🧪 win
✅ 🧪 bindings	⏳ 🛠 ios-sim	⏳ 🛠 mac-debug	⏳ 🛠 gtk	⏳ 🛠 wincairo
✅ 🧪 webkitperl	⏳ 🧪 ios-wk2	⏳ 🛠 mac-AS-debug	⏳ 🧪 gtk-wk2
	⏳ 🧪 api-ios	⏳ 🧪 api-mac	⏳ 🧪 api-gtk
⏳ 🛠 🧪 jsc	⏳ 🛠 tv	⏳ 🧪 mac-wk1	⏳ 🛠 jsc-armv7
	⏳ 🛠 tv-sim	⏳ 🧪 mac-wk2	⏳ 🧪 jsc-armv7-tests
	⏳ 🛠 watch	⏳ 🧪 mac-AS-debug-wk2
	⏳ 🛠 watch-sim	⏳ 🧪 mac-wk2-stress

[webkit-early-warning-system]

https://github.com/WebKit/WebKit/commit/9b6ae7b7c448c1fe2c63892b5c18f87142909709

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🛠 mac-AS-debug	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 api-mac	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk1
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2
	✅ 🛠 watch	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress

[Ahmad-S792]

@Constellation - It seems this reviewed and passing test PR didn't landed. It might need rebase unless if it is not needed anymore.