[CSS Container Queries] Correct container selection for pseudo-elements

[CSS Container Queries] Correct container selection for pseudo-elements
https://bugs.webkit.org/show_bug.cgi?id=239279

Reviewed by Simon Fraser.

Source/WebCore:

The element itself may be the container for its pseudo-elements.

* css/CSSPrimitiveValue.cpp:
(WebCore::CSSPrimitiveValue::computeNonCalcLengthDouble):
* style/ContainerQueryEvaluator.cpp:
(WebCore::Style::ContainerQueryEvaluator::ContainerQueryEvaluator):
(WebCore::Style::ContainerQueryEvaluator::selectContainer const):
(WebCore::Style::ContainerQueryEvaluator::selectContainer):
* style/ContainerQueryEvaluator.h:

Instead of passing the pseudo-element being matched, pass a container selection mode flag. The exact pseudo-element type
doesn't matter.

* style/ElementRuleCollector.cpp:
(WebCore::Style::ElementRuleCollector::containerQueriesMatch):

We need to use the pseudo-element mode when matching a rule that matches a pseudo-element, even when we are not actually resolving
the pseudo element. This is because regular element rule matching sets the style bits that indicate what pseudo-elements the
element has.

LayoutTests:

* TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@292819 268f45cc-cd09-0410-ab3c-d52691b4dbfc