REGRESSION (Safari 16): Dynamic viewport units (dvh) not matching viewport height

[dcrousso]

cd186d7

REGRESSION (Safari 16): Dynamic viewport units (dvh) not matching viewport height
https://bugs.webkit.org/show_bug.cgi?id=242758
<rdar://problem/97031866>

Reviewed by Simon Fraser.

This is likely a regression from two different commits.

248939@main started *always* setting an override for `sv*`/`lv*` based on `-[WKWebView setFrame:]`
whereas before they'd fall back to `FrameView::viewportConstrainedVisibleContentRect`, which takes
into account the `topContentInset`.

251232@main switched from using `RenderView::size` for `dvh` to using `FrameView::size` instead,
which does not take into account the `topContentInset`.

* Source/WebCore/page/FrameView.cpp:
(WebCore::FrameView::sizeForCSSDynamicViewportUnits const):
Use a different method that takes into account the `topContentInset`. This also matches the fallback
behavior for `sv*`/`lv*`.

* Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:
(-[WKWebView _recalculateViewportSizesWithMinimumViewportInset:maximumViewportInset:throwOnInvalidInput:]):
Include the `_topContentInset` when calculating the viewport sizes on macOS.

* Source/WebKit/UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::setTopContentInset):
* Source/WebKit/UIProcess/PageClient.h:
(WebKit::PageClient::topContentInsetDidChange): Added.
* Source/WebKit/UIProcess/Cocoa/PageClientImplCocoa.h:
* Source/WebKit/UIProcess/Cocoa/PageClientImplCocoa.mm:
(WebKit::PageClientImplCocoa::topContentInsetDidChange): Added.
Recalculate the viewport sizes whenever the `_topContentInset` changes (including `_automaticallyAdjustsContentInsets`).

* Tools/TestWebKitAPI/Tests/WebKitCocoa/CSSViewportUnits.mm:
(TEST.CSSViewportUnits.TopContentInset): Added.
(TEST.CSSViewportUnits.MinimumViewportInsetWithTopContentInset): Added.
(TEST.CSSViewportUnits.MaximumViewportInsetWithTopContentInset): Added.

Canonical link: https://commits.webkit.org/252878@main

[webkit-commit-queue]

Committed 252878@main (cd186d7): https://commits.webkit.org/252878@main

Reviewed commits have been landed. Closing PR #2765 and removing active labels.