Begin implementing parent frames navigating RemoteFrames

[achristensen07]

7c15d1c

Begin implementing parent frames navigating RemoteFrames
https://bugs.webkit.org/show_bug.cgi?id=256949
rdar://109497339

Reviewed by Chris Dumez.

The interesting part of this is in WebRemoteFrameClient::changeLocation,
where we call dispatchDecidePolicyForNavigationAction which I've made able
to handle a RemoteFrame, and if the result is PolicyAction::Use then we
call transitionToLocal then changeLocation which begins the provisional
load in this process.  A lot of things aren't quite hooked up completely
yet, but the progress is testable.

* Source/WebCore/loader/FrameLoadRequest.h:
* Source/WebCore/loader/NavigationScheduler.cpp:
(WebCore::ScheduledNavigation::shouldStartTimer):
(WebCore::ScheduledNavigation::didStartTimer):
(WebCore::ScheduledNavigation::didStopTimer):
(WebCore::NavigationScheduler::timerFired):
(WebCore::NavigationScheduler::startTimer):
(WebCore::NavigationScheduler::cancel):
* Source/WebCore/page/Frame.h:
* Source/WebCore/page/LocalFrame.cpp:
(WebCore::LocalFrame::changeLocation):
* Source/WebCore/page/LocalFrame.h:
* Source/WebCore/page/RemoteFrame.cpp:
(WebCore::RemoteFrame::changeLocation):
* Source/WebCore/page/RemoteFrame.h:
* Source/WebCore/page/RemoteFrameClient.h:
* Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction):
* Source/WebKit/WebProcess/WebCoreSupport/WebRemoteFrameClient.cpp:
(WebKit::WebRemoteFrameClient::changeLocation):
* Source/WebKit/WebProcess/WebCoreSupport/WebRemoteFrameClient.h:
* Source/WebKit/WebProcess/WebPage/WebFrame.cpp:
(WebKit::WebFrame::transitionToLocal):
* Source/WebKit/WebProcess/WebPage/WebFrame.h:
* Tools/TestWebKitAPI/Tests/WebKitCocoa/SiteIsolation.mm:
(TestWebKitAPI::TEST):

Canonical link: https://commits.webkit.org/264204@main

51e16c8

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

[webkit-early-warning-system]

EWS run on current version of this PR (hash 51e16c8)

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

[webkit-commit-queue]

Committed 264204@main (7c15d1c): https://commits.webkit.org/264204@main

Reviewed commits have been landed. Closing PR #14007 and removing active labels.