[LFC][IFC] Add justify text-align support.

[LFC][IFC] Add justify text-align support.
https://bugs.webkit.org/show_bug.cgi?id=190779

Reviewed by Antti Koivisto.

Collect expansion opportunities and adjust runs accordingly.

* layout/inlineformatting/InlineFormattingContext.cpp:
(WebCore::Layout::InlineFormattingContext::layoutInlineContent const):
* layout/inlineformatting/InlineFormattingContext.h:
* layout/inlineformatting/InlineRun.h:
(WebCore::Layout::InlineRun::expansionOpportunity):
(WebCore::Layout::InlineRun::TextContext::setStart):
(WebCore::Layout::InlineRun::TextContext::setLength):
(WebCore::Layout::InlineRun::setTextContext):
(WebCore::Layout::InlineRun::createRun): Deleted.
(WebCore::Layout::InlineRun::createTextRun): Deleted.
* layout/inlineformatting/Line.cpp:
(WebCore::Layout::InlineFormattingContext::Line::Line):
(WebCore::Layout::InlineFormattingContext::Line::init):
(WebCore::Layout::InlineFormattingContext::Line::computeExpansionOpportunities):
(WebCore::Layout::InlineFormattingContext::Line::appendContent):
(WebCore::Layout::InlineFormattingContext::Line::justifyRuns):
(WebCore::Layout::InlineFormattingContext::Line::close):
(WebCore::Layout::isNonCollapsedText): Deleted.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@237324 268f45cc-cd09-0410-ab3c-d52691b4dbfc