[LFC] Align shrink-to-fit width computation with the layout implementation.

[LFC] Align shrink-to-fit width computation with the layout implementation.
https://bugs.webkit.org/show_bug.cgi?id=191179

Reviewed by Antti Koivisto.

There are many similarities between layout and shrink-to-fit.
They both operate on formatting roots only (shrink-to-fit -> float, out-of-flow, inline-block) and in both cases
the algoritm depends on what type of formatting context the element establishes.

This patch is in preparation for transforming the "shrink-to-fit" width computation to make it behave more like layout.
With this change the instrinsicWidthConstraints() computation happens in the formatting context that the element establishes (similar to layout).

* layout/FormattingContext.cpp:
(WebCore::Layout::FormattingContext::computeOutOfFlowHorizontalGeometry const):
* layout/FormattingContext.h:
(WebCore::Layout::FormattingContext::Geometry::outOfFlowHorizontalGeometry):
(WebCore::Layout::FormattingContext::Geometry::floatingWidthAndMargin):
(WebCore::Layout::FormattingContext::Geometry::outOfFlowNonReplacedHorizontalGeometry):
(WebCore::Layout::FormattingContext::Geometry::floatingNonReplacedWidthAndMargin):
* layout/FormattingContextGeometry.cpp:
(WebCore::Layout::FormattingContext::Geometry::shrinkToFitWidth):
(WebCore::Layout::FormattingContext::Geometry::outOfFlowNonReplacedHorizontalGeometry):
(WebCore::Layout::FormattingContext::Geometry::floatingNonReplacedWidthAndMargin):
(WebCore::Layout::FormattingContext::Geometry::outOfFlowHorizontalGeometry):
(WebCore::Layout::FormattingContext::Geometry::floatingWidthAndMargin):
* layout/blockformatting/BlockFormattingContext.cpp:
(WebCore::Layout::BlockFormattingContext::computeWidthAndMargin const):
(WebCore::Layout::BlockFormattingContext::instrinsicWidthConstraints const):
* layout/blockformatting/BlockFormattingContext.h:
* layout/inlineformatting/InlineFormattingContext.cpp:
(WebCore::Layout::InlineFormattingContext::layoutFormattingContextRoot const):
(WebCore::Layout::InlineFormattingContext::instrinsicWidthConstraints const):
* layout/inlineformatting/InlineFormattingContext.h:
* layout/inlineformatting/InlineFormattingContextGeometry.cpp:
(WebCore::Layout::InlineFormattingContext::Geometry::inlineBlockWidthAndMargin):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@237729 268f45cc-cd09-0410-ab3c-d52691b4dbfc