Prepare Frame constructor to have RemoteFrame as the main frame in a site-isolated iframe process

[achristensen07]

a8f0d81

Prepare Frame constructor to have RemoteFrame as the main frame in a site-isolated iframe process
https://bugs.webkit.org/show_bug.cgi?id=253389

Reviewed by Chris Dumez.

There are two distinct types of Frames: one with an owner (subframe) and one without an owner (main frame).
We are about to need another type: a Frame with a parent in another process.  We will know about its parent
because we will have an AbstractFrame, but we won't have a HTMLFrameOwnerElement because it is in another process.
Frame::createSubframeHostedInAnotherProcess is introduced and soon to be used for this purpose.

Symmetrically, there needs to be three ways to construct a RemoteFrame: createMainFrame and createSubframe
just like the corresponding Frame constructors, but we will also need createSubframeWithContentsInAnotherProcess
to represent such a RemoteFrame in the process that has the HTMLFrameOwnerElement.

I also clean up the construction sites a little to pass non-null Pages and other parameters to where the should be.

* Source/WebCore/page/AbstractFrame.cpp:
(WebCore::AbstractFrame::AbstractFrame):
(WebCore::parentFrame): Deleted.
* Source/WebCore/page/AbstractFrame.h:
* Source/WebCore/page/Frame.cpp:
(WebCore::Frame::Frame):
(WebCore::Frame::createMainFrame):
(WebCore::Frame::createSubframe):
(WebCore::Frame::createSubframeHostedInAnotherProcess):
(WebCore::Frame::create): Deleted.
* Source/WebCore/page/Frame.h:
* Source/WebCore/page/Page.cpp:
(WebCore::Page::Page):
* Source/WebCore/page/RemoteFrame.cpp:
(WebCore::RemoteFrame::createMainFrame):
(WebCore::RemoteFrame::createSubframe):
(WebCore::RemoteFrame::createSubframeWithContentsInAnotherProcess):
(WebCore::RemoteFrame::RemoteFrame):
* Source/WebCore/page/RemoteFrame.h:
* Source/WebCore/rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::updateConfiguration):
* Source/WebKit/WebProcess/WebPage/WebFrame.cpp:
(WebKit::WebFrame::createSubframe):
(WebKit::WebFrame::didCommitLoadInAnotherProcess):
* Source/WebKitLegacy/mac/WebCoreSupport/WebFrameLoaderClient.mm:
(WebFrameLoaderClient::createFrame):
* Source/WebKitLegacy/mac/WebView/WebFrame.mm:
(+[WebFrame _createFrameWithPage:frameName:frameView:ownerElement:]):
(+[WebFrame _createSubframeWithOwnerElement:page:frameName:frameView:]):
(+[WebFrame _createSubframeWithOwnerElement:frameName:frameView:]): Deleted.
* Source/WebKitLegacy/mac/WebView/WebFrameInternal.h:

Canonical link: https://commits.webkit.org/261270@main

75caec7

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
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
	✅ 🛠 tv	✅ 🧪 mac-wk2	❌ 🧪 api-gtk
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	🧪 mac-wk2-stress
	✅ 🛠 watch-sim
✅ 🛠 🧪 unsafe-merge

[webkit-early-warning-system]

EWS run on current version of this PR (hash 75caec7)

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
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
	✅ 🛠 tv	✅ 🧪 mac-wk2	❌ 🧪 api-gtk
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	🧪 mac-wk2-stress
	✅ 🛠 watch-sim
✅ 🛠 🧪 unsafe-merge

[webkit-commit-queue]

Committed 261270@main (a8f0d81): https://commits.webkit.org/261270@main

Reviewed commits have been landed. Closing PR #11067 and removing active labels.