[LFC][IFC] Introduce InlineFormattingContextGeometry class

[LFC][IFC] Introduce InlineFormattingContextGeometry class
https://bugs.webkit.org/show_bug.cgi?id=191054

Reviewed by Antti Koivisto.

This is in preparation for inline-block support.

Move float and inline-block elements layout to layoutFormattingContextRoot().
computeWidthAndHeightForInlineBox takes care of replaced elements.

* Sources.txt:
* WebCore.xcodeproj/project.pbxproj:
* layout/inlineformatting/InlineFormattingContext.cpp:
(WebCore::Layout::InlineFormattingContext::layout const):
(WebCore::Layout::InlineFormattingContext::layoutFormattingContextRoot const):
(WebCore::Layout::InlineFormattingContext::computeWidthAndHeightForInlineBox const):
(WebCore::Layout::InlineFormattingContext::computeWidthAndHeight const): Deleted.
* layout/inlineformatting/InlineFormattingContext.h:
* layout/inlineformatting/InlineFormattingContextGeometry.cpp: Added.
(WebCore::Layout::InlineFormattingContext::Geometry::inlineBlockWidthAndMargin):
(WebCore::Layout::InlineFormattingContext::Geometry::inlineBlockHeightAndMargin):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@237588 268f45cc-cd09-0410-ab3c-d52691b4dbfc