[CSSRegions] Regions should not slice line box rendering

[CSSRegions] Regions should not slice line box rendering
https://bugs.webkit.org/show_bug.cgi?id=66198

Source/WebCore:

Created a new LayoutState constructor for the RenderFlowThread. It will
set m_isPaginated to true and force a pageHeight if 1. The actual pageHeight is
not used, because pageLogicalHeightForOffset will actually redirect the call
to RenderFlowThread.

Removed some of the duplicate code that calculated the page logical offset.
Added new methods like logicalPageOffset, pageLogicalHeightForOffset,
pageRemainingLogicalHeightForOffset.

There are still some issues related to incremental layout and different region widths.
Those issues will be addressed in different patches.

Reviewed by David Hyatt.

Tests: fast/regions/text-region-breaks.html
       fast/regions/text-region-split-horizontal-bt.html
       fast/regions/text-region-split-vertical-rl.html
       fast/regions/text-region-split-vertical.html
       fast/regions/text-region-split.html

* rendering/LayoutState.cpp:
(WebCore::LayoutState::LayoutState):
* rendering/LayoutState.h:
(WebCore::LayoutState::LayoutState):
(WebCore::LayoutState::isPaginated):
* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::positionNewFloats):
(WebCore::RenderBlock::adjustForRegionFittingIfNeeded):
(WebCore::RenderBlock::nextPageLogicalTopExcludingBoundaryPoint):
(WebCore::RenderBlock::nextPageLogicalTopIncludingBoundaryPoint):
(WebCore::inNormalFlow):
(WebCore::RenderBlock::applyBeforeBreak):
(WebCore::RenderBlock::applyAfterBreak):
(WebCore::RenderBlock::logicalPageOffset):
(WebCore::RenderBlock::pageLogicalHeightForOffset):
(WebCore::RenderBlock::pageRemainingLogicalHeightForOffset):
(WebCore::RenderBlock::adjustForUnsplittableChild):
(WebCore::RenderBlock::adjustLinePositionForPagination):
* rendering/RenderBlock.h:
* rendering/RenderFlowThread.cpp:
(WebCore::RenderFlowThread::layout):
(WebCore::RenderFlowThread::regionLogicalHeightForLine):
(WebCore::RenderFlowThread::regionRemainingLogicalHeightForLine):
* rendering/RenderFlowThread.h:
* rendering/RenderView.cpp:
(WebCore::RenderView::pushLayoutState):
* rendering/RenderView.h:
(WebCore::LayoutStateMaintainer::LayoutStateMaintainer):
(WebCore::LayoutStateMaintainer::push):

LayoutTests:

Also updated the results for some older tests that now work correctly.

Reviewed by David Hyatt.

* fast/regions/resources/helper.js:
(isDebugEnabled):
(assertEqualRects):
(testBoundingRects):
(assertRectContains):
(addPageLevelDebugBox):
(testContentToRegionsMapping):
* fast/regions/text-region-breaks-expected.txt: Added.
* fast/regions/text-region-breaks.html: Added.
* fast/regions/text-region-split-expected.txt: Added.
* fast/regions/text-region-split-horizontal-bt-expected.txt: Added.
* fast/regions/text-region-split-horizontal-bt.html: Added.
* fast/regions/text-region-split-vertical-expected.txt: Added.
* fast/regions/text-region-split-vertical-rl-expected.txt: Added.
* fast/regions/text-region-split-vertical-rl.html: Added.
* fast/regions/text-region-split-vertical.html: Added.
* fast/regions/text-region-split.html: Added.
* fast/regions/webkit-flow-floats-inside-regions-bounds-expected.txt:
* fast/regions/webkit-flow-inlines-inside-regions-bounds-expected.txt:
* fast/regions/webkit-flow-inlines-inside-regions-bounds-vertical-expected.txt:
* fast/regions/webkit-flow-inlines-inside-regions-bounds-vertical-rl-expected.txt:
* fast/repaint/japanese-rl-selection-repaint-in-regions.html:
* platform/mac/fast/repaint/japanese-rl-selection-repaint-in-regions-expected.png:
* platform/mac/fast/repaint/japanese-rl-selection-repaint-in-regions-expected.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95264 268f45cc-cd09-0410-ab3c-d52691b4dbfc