<https://webkit.org/b/124336>

Reviewed by David Hyatt.

In this change I introduced 'line' subdirectory inside 'rendering', this directory will contain all the classes
which have been refactored from RenderBlockLineLayout.cpp. This change contains the separation of BreakingContext,
and the separation of LineBreaker classes. Since I wanted to keep the helper functions organized, I also added a
new file called LineInlineHeaders.h, which contains the functions which used in LineBreaker.h and BreakingContext.h.
I moved LineInfo class into line directory. It was necessary this time, since I added a cpp for it. I'll move the
rest of the line layout related helper classes later. (I wanted to minimize merge conflicts.)

No new tests, no behavior change.

* CMakeLists.txt:
* GNUmakefile.am:
* GNUmakefile.list.am:
* WebCore.vcxproj/WebCore.vcxproj:
* WebCore.vcxproj/WebCoreCommon.props:
* WebCore.xcodeproj/project.pbxproj:
* rendering/RenderBlockLineLayout.cpp:
(WebCore::createRun):
* rendering/line/BreakingContextInlineHeaders.h: Added.
(WebCore::WordMeasurement::WordMeasurement):
(WebCore::TrailingObjects::TrailingObjects):
(WebCore::TrailingObjects::setTrailingWhitespace):
(WebCore::TrailingObjects::clear):
(WebCore::TrailingObjects::appendBoxIfNeeded):
(WebCore::deprecatedAddMidpoint):
(WebCore::startIgnoringSpaces):
(WebCore::stopIgnoringSpaces):
(WebCore::ensureLineBoxInsideIgnoredSpaces):
(WebCore::TrailingObjects::updateMidpointsForTrailingBoxes):
(WebCore::BreakingContext::BreakingContext):
(WebCore::BreakingContext::currentObject):
(WebCore::BreakingContext::lineBreak):
(WebCore::BreakingContext::lineBreakRef):
(WebCore::BreakingContext::lineWidth):
(WebCore::BreakingContext::atEnd):
(WebCore::BreakingContext::clearLineBreakIfFitsOnLine):
(WebCore::BreakingContext::commitLineBreakAtCurrentWidth):
(WebCore::BreakingContext::initializeForCurrentObject):
(WebCore::BreakingContext::increment):
(WebCore::BreakingContext::handleBR):
(WebCore::borderPaddingMarginStart):
(WebCore::borderPaddingMarginEnd):
(WebCore::shouldAddBorderPaddingMargin):
(WebCore::previousInFlowSibling):
(WebCore::inlineLogicalWidth):
(WebCore::BreakingContext::handleOutOfFlowPositioned):
(WebCore::BreakingContext::handleFloat):
(WebCore::shouldSkipWhitespaceAfterStartObject):
(WebCore::BreakingContext::handleEmptyInline):
(WebCore::BreakingContext::handleReplaced):
(WebCore::firstPositiveWidth):
(WebCore::updateSegmentsForShapes):
(WebCore::iteratorIsBeyondEndOfRenderCombineText):
(WebCore::nextCharacter):
(WebCore::updateCounterIfNeeded):
(WebCore::measureHyphenWidth):
(WebCore::textWidth):
(WebCore::ensureCharacterGetsLineBox):
(WebCore::tryHyphenating):
(WebCore::BreakingContext::handleText):
(WebCore::textBeginsWithBreakablePosition):
(WebCore::BreakingContext::canBreakAtThisPosition):
(WebCore::BreakingContext::commitAndUpdateLineBreakIfNeeded):
(WebCore::checkMidpoints):
(WebCore::BreakingContext::handleEndOfLine):
* rendering/line/LineBreaker.cpp: Added.
(WebCore::LineBreaker::reset):
(WebCore::LineBreaker::skipTrailingWhitespace):
(WebCore::LineBreaker::skipLeadingWhitespace):
* rendering/line/LineBreaker.h: Added.
(WebCore::LineBreaker::LineBreaker):
(WebCore::LineBreaker::lineWasHyphenated):
(WebCore::LineBreaker::positionedObjects):
(WebCore::LineBreaker::clear):
* rendering/line/LineInfo.cpp: Added.
(WebCore::LineInfo::setEmpty):
* rendering/line/LineInfo.h: Renamed from Source/WebCore/rendering/LineInfo.h.
(WebCore::LineInfo::LineInfo):
(WebCore::LineInfo::isFirstLine):
(WebCore::LineInfo::isLastLine):
(WebCore::LineInfo::isEmpty):
(WebCore::LineInfo::previousLineBrokeCleanly):
(WebCore::LineInfo::floatPaginationStrut):
(WebCore::LineInfo::runsFromLeadingWhitespace):
(WebCore::LineInfo::resetRunsFromLeadingWhitespace):
(WebCore::LineInfo::incrementRunsFromLeadingWhitespace):
(WebCore::LineInfo::setFirstLine):
(WebCore::LineInfo::setLastLine):
(WebCore::LineInfo::setPreviousLineBrokeCleanly):
(WebCore::LineInfo::setFloatPaginationStrut):
* rendering/line/LineInlineHeaders.h: Added.
(WebCore::hasInlineDirectionBordersPaddingOrMargin):
(WebCore::lineStyle):
(WebCore::requiresLineBoxForContent):
(WebCore::shouldCollapseWhiteSpace):
(WebCore::skipNonBreakingSpace):
(WebCore::alwaysRequiresLineBox):
(WebCore::requiresLineBox):
(WebCore::setStaticPositions):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159354 268f45cc-cd09-0410-ab3c-d52691b4dbfc