Remove CSS Grid Layout and grid media queries.

sky/engine/core/rendering/RenderGrid.cpp

Index: sky/engine/core/rendering/RenderGrid.cpp
diff --git a/sky/engine/core/rendering/RenderGrid.cpp b/sky/engine/core/rendering/RenderGrid.cpp
deleted file mode 100644
index 610d37d1e09392df49b06976ef27378d21c1a54d..0000000000000000000000000000000000000000
--- a/sky/engine/core/rendering/RenderGrid.cpp
+++ /dev/null
@@ -1,1397 +0,0 @@
-/*
- * Copyright (C) 2011 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/rendering/RenderGrid.h"
-
-#include "core/rendering/RenderLayer.h"
-#include "core/rendering/RenderView.h"
-#include "core/rendering/style/GridCoordinate.h"
-#include "platform/LengthFunctions.h"
-
-namespace blink {
-
-static const int infinity = -1;
-
-class GridTrack {
-public:
-    GridTrack()
-        : m_usedBreadth(0)
-        , m_maxBreadth(0)
-    {
-    }
-
-    void growUsedBreadth(LayoutUnit growth)
-    {
-        ASSERT(growth >= 0);
-        m_usedBreadth += growth;
-    }
-    LayoutUnit usedBreadth() const { return m_usedBreadth; }
-
-    void growMaxBreadth(LayoutUnit growth)
-    {
-        if (m_maxBreadth == infinity)
-            m_maxBreadth = m_usedBreadth + growth;
-        else
-            m_maxBreadth += growth;
-    }
-    LayoutUnit maxBreadthIfNotInfinite() const
-    {
-        return (m_maxBreadth == infinity) ? m_usedBreadth : m_maxBreadth;
-    }
-
-    LayoutUnit m_usedBreadth;
-    LayoutUnit m_maxBreadth;
-};
-
-struct GridTrackForNormalization {
-    GridTrackForNormalization(const GridTrack& track, double flex)
-        : m_track(&track)
-        , m_flex(flex)
-        , m_normalizedFlexValue(track.m_usedBreadth / flex)
-    {
-    }
-
-    // Required by std::sort.
-    GridTrackForNormalization& operator=(const GridTrackForNormalization& o)
-    {
-        m_track = o.m_track;
-        m_flex = o.m_flex;
-        m_normalizedFlexValue = o.m_normalizedFlexValue;
-        return *this;
-    }
-
-    const GridTrack* m_track;
-    double m_flex;
-    LayoutUnit m_normalizedFlexValue;
-};
-
-class RenderGrid::GridIterator {
-    WTF_MAKE_NONCOPYABLE(GridIterator);
-public:
-    // |direction| is the direction that is fixed to |fixedTrackIndex| so e.g
-    // GridIterator(m_grid, ForColumns, 1) will walk over the rows of the 2nd column.
-    GridIterator(const GridRepresentation& grid, GridTrackSizingDirection direction, size_t fixedTrackIndex, size_t varyingTrackIndex = 0)
-        : m_grid(grid)
-        , m_direction(direction)
-        , m_rowIndex((direction == ForColumns) ? varyingTrackIndex : fixedTrackIndex)
-        , m_columnIndex((direction == ForColumns) ? fixedTrackIndex : varyingTrackIndex)
-        , m_childIndex(0)
-    {
-        ASSERT(m_rowIndex < m_grid.size());
-        ASSERT(m_columnIndex < m_grid[0].size());
-    }
-
-    RenderBox* nextGridItem()
-    {
-        ASSERT(!m_grid.isEmpty());
-
-        size_t& varyingTrackIndex = (m_direction == ForColumns) ? m_rowIndex : m_columnIndex;
-        const size_t endOfVaryingTrackIndex = (m_direction == ForColumns) ? m_grid.size() : m_grid[0].size();
-        for (; varyingTrackIndex < endOfVaryingTrackIndex; ++varyingTrackIndex) {
-            const GridCell& children = m_grid[m_rowIndex][m_columnIndex];
-            if (m_childIndex < children.size())
-                return children[m_childIndex++];
-
-            m_childIndex = 0;
-        }
-        return 0;
-    }
-
-    bool checkEmptyCells(size_t rowSpan, size_t columnSpan) const
-    {
-        // Ignore cells outside current grid as we will grow it later if needed.
-        size_t maxRows = std::min(m_rowIndex + rowSpan, m_grid.size());
-        size_t maxColumns = std::min(m_columnIndex + columnSpan, m_grid[0].size());
-
-        // This adds a O(N^2) behavior that shouldn't be a big deal as we expect spanning areas to be small.
-        for (size_t row = m_rowIndex; row < maxRows; ++row) {
-            for (size_t column = m_columnIndex; column < maxColumns; ++column) {
-                const GridCell& children = m_grid[row][column];
-                if (!children.isEmpty())
-                    return false;
-            }
-        }
-
-        return true;
-    }
-
-    PassOwnPtr<GridCoordinate> nextEmptyGridArea(size_t fixedTrackSpan, size_t varyingTrackSpan)
-    {
-        ASSERT(!m_grid.isEmpty());
-        ASSERT(fixedTrackSpan >= 1 && varyingTrackSpan >= 1);
-
-        size_t rowSpan = (m_direction == ForColumns) ? varyingTrackSpan : fixedTrackSpan;
-        size_t columnSpan = (m_direction == ForColumns) ? fixedTrackSpan : varyingTrackSpan;
-
-        size_t& varyingTrackIndex = (m_direction == ForColumns) ? m_rowIndex : m_columnIndex;
-        const size_t endOfVaryingTrackIndex = (m_direction == ForColumns) ? m_grid.size() : m_grid[0].size();
-        for (; varyingTrackIndex < endOfVaryingTrackIndex; ++varyingTrackIndex) {
-            if (checkEmptyCells(rowSpan, columnSpan)) {
-                OwnPtr<GridCoordinate> result = adoptPtr(new GridCoordinate(GridSpan(m_rowIndex, m_rowIndex + rowSpan - 1), GridSpan(m_columnIndex, m_columnIndex + columnSpan - 1)));
-                // Advance the iterator to avoid an infinite loop where we would return the same grid area over and over.
-                ++varyingTrackIndex;
-                return result.release();
-            }
-        }
-        return nullptr;
-    }
-
-private:
-    const GridRepresentation& m_grid;
-    GridTrackSizingDirection m_direction;
-    size_t m_rowIndex;
-    size_t m_columnIndex;
-    size_t m_childIndex;
-};
-
-struct RenderGrid::GridSizingData {
-    WTF_MAKE_NONCOPYABLE(GridSizingData);
-public:
-    GridSizingData(size_t gridColumnCount, size_t gridRowCount)
-        : columnTracks(gridColumnCount)
-        , rowTracks(gridRowCount)
-    {
-    }
-
-    Vector<GridTrack> columnTracks;
-    Vector<GridTrack> rowTracks;
-    Vector<size_t> contentSizedTracksIndex;
-
-    // Performance optimization: hold onto these Vectors until the end of Layout to avoid repeated malloc / free.
-    Vector<LayoutUnit> distributeTrackVector;
-    Vector<GridTrack*> filteredTracks;
-};
-
-RenderGrid::RenderGrid(Element* element)
-    : RenderBlock(element)
-    , m_gridIsDirty(true)
-    , m_orderIterator(this)
-{
-    ASSERT(!childrenInline());
-}
-
-RenderGrid::~RenderGrid()
-{
-}
-
-void RenderGrid::addChild(RenderObject* newChild, RenderObject* beforeChild)
-{
-    // If the new requested beforeChild is not one of our children is because it's wrapped by an anonymous container. If
-    // we do not special case this situation we could end up calling addChild() twice for the newChild, one with the
-    // initial beforeChild and another one with its parent.
-    if (beforeChild && beforeChild->parent() != this) {
-        ASSERT(beforeChild->parent()->isAnonymous());
-        beforeChild = splitAnonymousBoxesAroundChild(beforeChild);
-        dirtyGrid();
-    }
-
-    RenderBlock::addChild(newChild, beforeChild);
-
-    if (gridIsDirty())
-        return;
-
-    if (!newChild->isBox()) {
-        dirtyGrid();
-        return;
-    }
-
-    // FIXME: Implement properly "stack" value in auto-placement algorithm.
-    if (!style()->isGridAutoFlowAlgorithmStack()) {
-        // The grid needs to be recomputed as it might contain auto-placed items that will change their position.
-        dirtyGrid();
-        return;
-    }
-
-    RenderBox* newChildBox = toRenderBox(newChild);
-    OwnPtr<GridSpan> rowPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *newChildBox, ForRows);
-    OwnPtr<GridSpan> columnPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *newChildBox, ForColumns);
-    if (!rowPositions || !columnPositions) {
-        // The new child requires the auto-placement algorithm to run so we need to recompute the grid fully.
-        dirtyGrid();
-        return;
-    } else {
-        insertItemIntoGrid(newChildBox, GridCoordinate(*rowPositions, *columnPositions));
-        addChildToIndexesMap(newChildBox);
-    }
-}
-
-void RenderGrid::addChildToIndexesMap(RenderBox* child)
-{
-    ASSERT(!m_gridItemsIndexesMap.contains(child));
-    RenderBox* sibling = child->nextSiblingBox();
-    bool lastSibling = !sibling;
-
-    if (lastSibling)
-        sibling = child->previousSiblingBox();
-
-    size_t index = 0;
-    if (sibling)
-        index = lastSibling ? m_gridItemsIndexesMap.get(sibling) + 1 : m_gridItemsIndexesMap.get(sibling);
-
-    if (sibling && !lastSibling) {
-        for (; sibling; sibling = sibling->nextSiblingBox())
-            m_gridItemsIndexesMap.set(sibling, m_gridItemsIndexesMap.get(sibling) + 1);
-    }
-
-    m_gridItemsIndexesMap.set(child, index);
-}
-
-void RenderGrid::removeChild(RenderObject* child)
-{
-    RenderBlock::removeChild(child);
-
-    if (gridIsDirty())
-        return;
-
-    ASSERT(child->isBox());
-
-    // FIXME: Implement properly "stack" value in auto-placement algorithm.
-    if (!style()->isGridAutoFlowAlgorithmStack()) {
-        // The grid needs to be recomputed as it might contain auto-placed items that will change their position.
-        dirtyGrid();
-        return;
-    }
-
-    const RenderBox* childBox = toRenderBox(child);
-    GridCoordinate coordinate = m_gridItemCoordinate.take(childBox);
-
-    for (GridSpan::iterator row = coordinate.rows.begin(); row != coordinate.rows.end(); ++row) {
-        for (GridSpan::iterator column = coordinate.columns.begin(); column != coordinate.columns.end(); ++column) {
-            GridCell& cell = m_grid[row.toInt()][column.toInt()];
-            cell.remove(cell.find(childBox));
-        }
-    }
-
-    m_gridItemsIndexesMap.remove(childBox);
-}
-
-void RenderGrid::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
-{
-    RenderBlock::styleDidChange(diff, oldStyle);
-    if (!oldStyle)
-        return;
-
-    // FIXME: The following checks could be narrowed down if we kept track of which type of grid items we have:
-    // - explicit grid size changes impact negative explicitely positioned and auto-placed grid items.
-    // - named grid lines only impact grid items with named grid lines.
-    // - auto-flow changes only impacts auto-placed children.
-
-    if (explicitGridDidResize(oldStyle)
-        || namedGridLinesDefinitionDidChange(oldStyle)
-        || oldStyle->gridAutoFlow() != style()->gridAutoFlow())
-        dirtyGrid();
-}
-
-bool RenderGrid::explicitGridDidResize(const RenderStyle* oldStyle) const
-{
-    return oldStyle->gridTemplateColumns().size() != style()->gridTemplateColumns().size()
-        || oldStyle->gridTemplateRows().size() != style()->gridTemplateRows().size();
-}
-
-bool RenderGrid::namedGridLinesDefinitionDidChange(const RenderStyle* oldStyle) const
-{
-    return oldStyle->namedGridRowLines() != style()->namedGridRowLines()
-        || oldStyle->namedGridColumnLines() != style()->namedGridColumnLines();
-}
-
-void RenderGrid::layoutBlock(bool relayoutChildren)
-{
-    ASSERT(needsLayout());
-
-    if (!relayoutChildren && simplifiedLayout())
-        return;
-
-    // FIXME: Much of this method is boiler plate that matches RenderBox::layoutBlock and Render*FlexibleBox::layoutBlock.
-    // It would be nice to refactor some of the duplicate code.
-    LayoutState state(*this, locationOffset());
-
-    LayoutSize previousSize = size();
-
-    setLogicalHeight(0);
-    updateLogicalWidth();
-
-    layoutGridItems();
-
-    LayoutUnit oldClientAfterEdge = clientLogicalBottom();
-    updateLogicalHeight();
-
-    if (size() != previousSize)
-        relayoutChildren = true;
-
-    layoutPositionedObjects(relayoutChildren || isDocumentElement());
-
-    computeOverflow(oldClientAfterEdge);
-
-    updateLayerTransformAfterLayout();
-
-    // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if
-    // we overflow or not.
-    if (hasOverflowClip())
-        layer()->scrollableArea()->updateAfterLayout();
-
-    clearNeedsLayout();
-}
-
-void RenderGrid::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
-{
-    const_cast<RenderGrid*>(this)->placeItemsOnGrid();
-
-    GridSizingData sizingData(gridColumnCount(), gridRowCount());
-    LayoutUnit availableLogicalSpace = 0;
-    const_cast<RenderGrid*>(this)->computeUsedBreadthOfGridTracks(ForColumns, sizingData, availableLogicalSpace);
-
-    for (size_t i = 0; i < sizingData.columnTracks.size(); ++i) {
-        LayoutUnit minTrackBreadth = sizingData.columnTracks[i].m_usedBreadth;
-        LayoutUnit maxTrackBreadth = sizingData.columnTracks[i].m_maxBreadth;
-        maxTrackBreadth = std::max(maxTrackBreadth, minTrackBreadth);
-
-        minLogicalWidth += minTrackBreadth;
-        maxLogicalWidth += maxTrackBreadth;
-
-        // FIXME: This should add in the scrollbarWidth (e.g. see RenderFlexibleBox).
-    }
-}
-
-void RenderGrid::computePreferredLogicalWidths()
-{
-    ASSERT(preferredLogicalWidthsDirty());
-
-    m_minPreferredLogicalWidth = 0;
-    m_maxPreferredLogicalWidth = 0;
-
-    // FIXME: We don't take our own logical width into account. Once we do, we need to make sure
-    // we apply (and test the interaction with) min-width / max-width.
-
-    computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
-
-    LayoutUnit borderAndPaddingInInlineDirection = borderAndPaddingLogicalWidth();
-    m_minPreferredLogicalWidth += borderAndPaddingInInlineDirection;
-    m_maxPreferredLogicalWidth += borderAndPaddingInInlineDirection;
-
-    clearPreferredLogicalWidthsDirty();
-}
-
-void RenderGrid::computeUsedBreadthOfGridTracks(GridTrackSizingDirection direction, GridSizingData& sizingData)
-{
-    LayoutUnit availableLogicalSpace = (direction == ForColumns) ? availableLogicalWidth() : availableLogicalHeight(IncludeMarginBorderPadding);
-    computeUsedBreadthOfGridTracks(direction, sizingData, availableLogicalSpace);
-}
-
-bool RenderGrid::gridElementIsShrinkToFit()
-{
-    return isFloatingOrOutOfFlowPositioned();
-}
-
-void RenderGrid::computeUsedBreadthOfGridTracks(GridTrackSizingDirection direction, GridSizingData& sizingData, LayoutUnit& availableLogicalSpace)
-{
-    Vector<GridTrack>& tracks = (direction == ForColumns) ? sizingData.columnTracks : sizingData.rowTracks;
-    Vector<size_t> flexibleSizedTracksIndex;
-    sizingData.contentSizedTracksIndex.shrink(0);
-
-    // 1. Initialize per Grid track variables.
-    for (size_t i = 0; i < tracks.size(); ++i) {
-        GridTrack& track = tracks[i];
-        const GridTrackSize& trackSize = gridTrackSize(direction, i);
-        const GridLength& minTrackBreadth = trackSize.minTrackBreadth();
-        const GridLength& maxTrackBreadth = trackSize.maxTrackBreadth();
-
-        track.m_usedBreadth = computeUsedBreadthOfMinLength(direction, minTrackBreadth);
-        track.m_maxBreadth = computeUsedBreadthOfMaxLength(direction, maxTrackBreadth, track.m_usedBreadth);
-
-        if (track.m_maxBreadth != infinity)
-            track.m_maxBreadth = std::max(track.m_maxBreadth, track.m_usedBreadth);
-
-        if (trackSize.isContentSized())
-            sizingData.contentSizedTracksIndex.append(i);
-        if (trackSize.maxTrackBreadth().isFlex())
-            flexibleSizedTracksIndex.append(i);
-    }
-
-    // 2. Resolve content-based TrackSizingFunctions.
-    if (!sizingData.contentSizedTracksIndex.isEmpty())
-        resolveContentBasedTrackSizingFunctions(direction, sizingData, availableLogicalSpace);
-
-    for (size_t i = 0; i < tracks.size(); ++i) {
-        ASSERT(tracks[i].m_maxBreadth != infinity);
-        availableLogicalSpace -= tracks[i].m_usedBreadth;
-    }
-
-    const bool hasUndefinedRemainingSpace = (direction == ForRows) ? style()->logicalHeight().isAuto() : gridElementIsShrinkToFit();
-
-    if (!hasUndefinedRemainingSpace && availableLogicalSpace <= 0)
-        return;
-
-    // 3. Grow all Grid tracks in GridTracks from their UsedBreadth up to their MaxBreadth value until
-    // availableLogicalSpace (RemainingSpace in the specs) is exhausted.
-    const size_t tracksSize = tracks.size();
-    if (!hasUndefinedRemainingSpace) {
-        Vector<GridTrack*> tracksForDistribution(tracksSize);
-        for (size_t i = 0; i < tracksSize; ++i)
-            tracksForDistribution[i] = tracks.data() + i;
-
-        distributeSpaceToTracks(tracksForDistribution, 0, &GridTrack::usedBreadth, &GridTrack::growUsedBreadth, sizingData, availableLogicalSpace);
-    } else {
-        for (size_t i = 0; i < tracksSize; ++i)
-            tracks[i].m_usedBreadth = tracks[i].m_maxBreadth;
-    }
-
-    if (flexibleSizedTracksIndex.isEmpty())
-        return;
-
-    // 4. Grow all Grid tracks having a fraction as the MaxTrackSizingFunction.
-    double normalizedFractionBreadth = 0;
-    if (!hasUndefinedRemainingSpace) {
-        normalizedFractionBreadth = computeNormalizedFractionBreadth(tracks, GridSpan(0, tracks.size() - 1), direction, availableLogicalSpace);
-    } else {
-        for (size_t i = 0; i < flexibleSizedTracksIndex.size(); ++i) {
-            const size_t trackIndex = flexibleSizedTracksIndex[i];
-            const GridTrackSize& trackSize = gridTrackSize(direction, trackIndex);
-            normalizedFractionBreadth = std::max(normalizedFractionBreadth, tracks[trackIndex].m_usedBreadth / trackSize.maxTrackBreadth().flex());
-        }
-
-        for (size_t i = 0; i < flexibleSizedTracksIndex.size(); ++i) {
-            GridIterator iterator(m_grid, direction, flexibleSizedTracksIndex[i]);
-            while (RenderBox* gridItem = iterator.nextGridItem()) {
-                const GridCoordinate coordinate = cachedGridCoordinate(gridItem);
-                const GridSpan span = (direction == ForColumns) ? coordinate.columns : coordinate.rows;
-
-                // Do not include already processed items.
-                if (i > 0 && span.resolvedInitialPosition.toInt() <= flexibleSizedTracksIndex[i - 1])
-                    continue;
-
-                double itemNormalizedFlexBreadth = computeNormalizedFractionBreadth(tracks, span, direction, maxContentForChild(gridItem, direction, sizingData.columnTracks));
-                normalizedFractionBreadth = std::max(normalizedFractionBreadth, itemNormalizedFlexBreadth);
-            }
-        }
-    }
-
-    for (size_t i = 0; i < flexibleSizedTracksIndex.size(); ++i) {
-        const size_t trackIndex = flexibleSizedTracksIndex[i];
-        const GridTrackSize& trackSize = gridTrackSize(direction, trackIndex);
-
-        tracks[trackIndex].m_usedBreadth = std::max<LayoutUnit>(tracks[trackIndex].m_usedBreadth, normalizedFractionBreadth * trackSize.maxTrackBreadth().flex());
-    }
-}
-
-LayoutUnit RenderGrid::computeUsedBreadthOfMinLength(GridTrackSizingDirection direction, const GridLength& gridLength) const
-{
-    if (gridLength.isFlex())
-        return 0;
-
-    const Length& trackLength = gridLength.length();
-    ASSERT(!trackLength.isAuto());
-    if (trackLength.isSpecified())
-        return computeUsedBreadthOfSpecifiedLength(direction, trackLength);
-
-    ASSERT(trackLength.isMinContent() || trackLength.isMaxContent());
-    return 0;
-}
-
-LayoutUnit RenderGrid::computeUsedBreadthOfMaxLength(GridTrackSizingDirection direction, const GridLength& gridLength, LayoutUnit usedBreadth) const
-{
-    if (gridLength.isFlex())
-        return usedBreadth;
-
-    const Length& trackLength = gridLength.length();
-    ASSERT(!trackLength.isAuto());
-    if (trackLength.isSpecified()) {
-        LayoutUnit computedBreadth = computeUsedBreadthOfSpecifiedLength(direction, trackLength);
-        ASSERT(computedBreadth != infinity);
-        return computedBreadth;
-    }
-
-    ASSERT(trackLength.isMinContent() || trackLength.isMaxContent());
-    return infinity;
-}
-
-LayoutUnit RenderGrid::computeUsedBreadthOfSpecifiedLength(GridTrackSizingDirection direction, const Length& trackLength) const
-{
-    ASSERT(trackLength.isSpecified());
-    // FIXME: The -1 here should be replaced by whatever the intrinsic height of the grid is.
-    return valueForLength(trackLength, direction == ForColumns ? logicalWidth() : computeContentLogicalHeight(style()->logicalHeight(), -1));
-}
-
-static bool sortByGridNormalizedFlexValue(const GridTrackForNormalization& track1, const GridTrackForNormalization& track2)
-{
-    return track1.m_normalizedFlexValue < track2.m_normalizedFlexValue;
-}
-
-double RenderGrid::computeNormalizedFractionBreadth(Vector<GridTrack>& tracks, const GridSpan& tracksSpan, GridTrackSizingDirection direction, LayoutUnit availableLogicalSpace) const
-{
-    // |availableLogicalSpace| already accounts for the used breadths so no need to remove it here.
-
-    Vector<GridTrackForNormalization> tracksForNormalization;
-    for (GridSpan::iterator resolvedPosition = tracksSpan.begin(); resolvedPosition != tracksSpan.end(); ++resolvedPosition) {
-        const GridTrackSize& trackSize = gridTrackSize(direction, resolvedPosition.toInt());
-        if (!trackSize.maxTrackBreadth().isFlex())
-            continue;
-
-        tracksForNormalization.append(GridTrackForNormalization(tracks[resolvedPosition.toInt()], trackSize.maxTrackBreadth().flex()));
-    }
-
-    // The function is not called if we don't have <flex> grid tracks
-    ASSERT(!tracksForNormalization.isEmpty());
-
-    std::sort(tracksForNormalization.begin(), tracksForNormalization.end(), sortByGridNormalizedFlexValue);
-
-    // These values work together: as we walk over our grid tracks, we increase fractionValueBasedOnGridItemsRatio
-    // to match a grid track's usedBreadth to <flex> ratio until the total fractions sized grid tracks wouldn't
-    // fit into availableLogicalSpaceIgnoringFractionTracks.
-    double accumulatedFractions = 0;
-    LayoutUnit fractionValueBasedOnGridItemsRatio = 0;
-    LayoutUnit availableLogicalSpaceIgnoringFractionTracks = availableLogicalSpace;
-
-    for (size_t i = 0; i < tracksForNormalization.size(); ++i) {
-        const GridTrackForNormalization& track = tracksForNormalization[i];
-        if (track.m_normalizedFlexValue > fractionValueBasedOnGridItemsRatio) {
-            // If the normalized flex value (we ordered |tracksForNormalization| by increasing normalized flex value)
-            // will make us overflow our container, then stop. We have the previous step's ratio is the best fit.
-            if (track.m_normalizedFlexValue * accumulatedFractions > availableLogicalSpaceIgnoringFractionTracks)
-                break;
-
-            fractionValueBasedOnGridItemsRatio = track.m_normalizedFlexValue;
-        }
-
-        accumulatedFractions += track.m_flex;
-        // This item was processed so we re-add its used breadth to the available space to accurately count the remaining space.
-        availableLogicalSpaceIgnoringFractionTracks += track.m_track->m_usedBreadth;
-    }
-
-    return availableLogicalSpaceIgnoringFractionTracks / accumulatedFractions;
-}
-
-const GridTrackSize& RenderGrid::gridTrackSize(GridTrackSizingDirection direction, size_t i) const
-{
-    const Vector<GridTrackSize>& trackStyles = (direction == ForColumns) ? style()->gridTemplateColumns() : style()->gridTemplateRows();
-    if (i >= trackStyles.size())
-        return (direction == ForColumns) ? style()->gridAutoColumns() : style()->gridAutoRows();
-
-    const GridTrackSize& trackSize = trackStyles[i];
-    // If the logical width/height of the grid container is indefinite, percentage values are treated as <auto>.
-    if (trackSize.isPercentage()) {
-        Length logicalSize = direction == ForColumns ? style()->logicalWidth() : style()->logicalHeight();
-        if (logicalSize.isIntrinsicOrAuto()) {
-            DEFINE_STATIC_LOCAL(GridTrackSize, autoTrackSize, (Length(Auto)));
-            return autoTrackSize;
-        }
-    }
-
-    return trackSize;
-}
-
-LayoutUnit RenderGrid::logicalHeightForChild(RenderBox* child, Vector<GridTrack>& columnTracks)
-{
-    SubtreeLayoutScope layoutScope(*child);
-    LayoutUnit oldOverrideContainingBlockContentLogicalWidth = child->hasOverrideContainingBlockLogicalWidth() ? child->overrideContainingBlockContentLogicalWidth() : LayoutUnit();
-    LayoutUnit overrideContainingBlockContentLogicalWidth = gridAreaBreadthForChild(child, ForColumns, columnTracks);
-    if (child->style()->logicalHeight().isPercent() || oldOverrideContainingBlockContentLogicalWidth != overrideContainingBlockContentLogicalWidth)
-        layoutScope.setNeedsLayout(child);
-
-    child->setOverrideContainingBlockContentLogicalWidth(overrideContainingBlockContentLogicalWidth);
-    // If |child| has a percentage logical height, we shouldn't let it override its intrinsic height, which is
-    // what we are interested in here. Thus we need to set the override logical height to -1 (no possible resolution).
-    child->setOverrideContainingBlockContentLogicalHeight(-1);
-    child->layoutIfNeeded();
-    return child->logicalHeight() + child->marginLogicalHeight();
-}
-
-LayoutUnit RenderGrid::minContentForChild(RenderBox* child, GridTrackSizingDirection direction, Vector<GridTrack>& columnTracks)
-{
-    if (direction == ForColumns) {
-        // FIXME: It's unclear if we should return the intrinsic width or the preferred width.
-        // See http://lists.w3.org/Archives/Public/www-style/2013Jan/0245.html
-        return child->minPreferredLogicalWidth() + marginIntrinsicLogicalWidthForChild(child);
-    }
-
-    return logicalHeightForChild(child, columnTracks);
-}
-
-LayoutUnit RenderGrid::maxContentForChild(RenderBox* child, GridTrackSizingDirection direction, Vector<GridTrack>& columnTracks)
-{
-    if (direction == ForColumns) {
-        // FIXME: It's unclear if we should return the intrinsic width or the preferred width.
-        // See http://lists.w3.org/Archives/Public/www-style/2013Jan/0245.html
-        return child->maxPreferredLogicalWidth() + marginIntrinsicLogicalWidthForChild(child);
-    }
-
-    return logicalHeightForChild(child, columnTracks);
-}
-
-size_t RenderGrid::gridItemSpan(const RenderBox* child, GridTrackSizingDirection direction)
-{
-    GridCoordinate childCoordinate = cachedGridCoordinate(child);
-    GridSpan childSpan = (direction == ForRows) ? childCoordinate.rows : childCoordinate.columns;
-
-    return childSpan.resolvedFinalPosition.toInt() - childSpan.resolvedInitialPosition.toInt() + 1;
-}
-
-typedef std::pair<RenderBox*, size_t> GridItemWithSpan;
-
-// This function sorts by span (.second in the pair) but also places pointers (.first in the pair) to the same object in
-// consecutive positions so duplicates could be easily removed with std::unique() for example.
-static bool gridItemWithSpanSorter(const GridItemWithSpan& item1, const GridItemWithSpan& item2)
-{
-    if (item1.second != item2.second)
-        return item1.second < item2.second;
-
-    return item1.first < item2.first;
-}
-
-static bool uniquePointerInPair(const GridItemWithSpan& item1, const GridItemWithSpan& item2)
-{
-    return item1.first == item2.first;
-}
-
-void RenderGrid::resolveContentBasedTrackSizingFunctions(GridTrackSizingDirection direction, GridSizingData& sizingData, LayoutUnit& availableLogicalSpace)
-{
-    // FIXME: Split the grid tracks into groups that doesn't overlap a <flex> grid track (crbug.com/235258).
-
-    for (size_t i = 0; i < sizingData.contentSizedTracksIndex.size(); ++i) {
-        size_t trackIndex = sizingData.contentSizedTracksIndex[i];
-        GridIterator iterator(m_grid, direction, trackIndex);
-        Vector<GridItemWithSpan> itemsSortedByIncreasingSpan;
-
-        while (RenderBox* gridItem = iterator.nextGridItem())
-            itemsSortedByIncreasingSpan.append(std::make_pair(gridItem, gridItemSpan(gridItem, direction)));
-        std::stable_sort(itemsSortedByIncreasingSpan.begin(), itemsSortedByIncreasingSpan.end(), gridItemWithSpanSorter);
-        Vector<GridItemWithSpan>::iterator end = std::unique(itemsSortedByIncreasingSpan.begin(), itemsSortedByIncreasingSpan.end(), uniquePointerInPair);
-
-        for (Vector<GridItemWithSpan>::iterator it = itemsSortedByIncreasingSpan.begin(); it != end; ++it) {
-            RenderBox* gridItem = it->first;
-            resolveContentBasedTrackSizingFunctionsForItems(direction, sizingData, gridItem, &GridTrackSize::hasMinOrMaxContentMinTrackBreadth, &RenderGrid::minContentForChild, &GridTrack::usedBreadth, &GridTrack::growUsedBreadth);
-            resolveContentBasedTrackSizingFunctionsForItems(direction, sizingData, gridItem, &GridTrackSize::hasMaxContentMinTrackBreadth, &RenderGrid::maxContentForChild, &GridTrack::usedBreadth, &GridTrack::growUsedBreadth);
-            resolveContentBasedTrackSizingFunctionsForItems(direction, sizingData, gridItem, &GridTrackSize::hasMinOrMaxContentMaxTrackBreadth, &RenderGrid::minContentForChild, &GridTrack::maxBreadthIfNotInfinite, &GridTrack::growMaxBreadth);
-            resolveContentBasedTrackSizingFunctionsForItems(direction, sizingData, gridItem, &GridTrackSize::hasMaxContentMaxTrackBreadth, &RenderGrid::maxContentForChild, &GridTrack::maxBreadthIfNotInfinite, &GridTrack::growMaxBreadth);
-        }
-
-        GridTrack& track = (direction == ForColumns) ? sizingData.columnTracks[trackIndex] : sizingData.rowTracks[trackIndex];
-        if (track.m_maxBreadth == infinity)
-            track.m_maxBreadth = track.m_usedBreadth;
-    }
-}
-
-void RenderGrid::resolveContentBasedTrackSizingFunctionsForItems(GridTrackSizingDirection direction, GridSizingData& sizingData, RenderBox* gridItem, FilterFunction filterFunction, SizingFunction sizingFunction, AccumulatorGetter trackGetter, AccumulatorGrowFunction trackGrowthFunction)
-{
-    const GridCoordinate coordinate = cachedGridCoordinate(gridItem);
-    const GridResolvedPosition initialTrackPosition = (direction == ForColumns) ? coordinate.columns.resolvedInitialPosition : coordinate.rows.resolvedInitialPosition;
-    const GridResolvedPosition finalTrackPosition = (direction == ForColumns) ? coordinate.columns.resolvedFinalPosition : coordinate.rows.resolvedFinalPosition;
-
-    sizingData.filteredTracks.shrink(0);
-    for (GridResolvedPosition trackPosition = initialTrackPosition; trackPosition <= finalTrackPosition; ++trackPosition) {
-        const GridTrackSize& trackSize = gridTrackSize(direction, trackPosition.toInt());
-        if (!(trackSize.*filterFunction)())
-            continue;
-
-        GridTrack& track = (direction == ForColumns) ? sizingData.columnTracks[trackPosition.toInt()] : sizingData.rowTracks[trackPosition.toInt()];
-        sizingData.filteredTracks.append(&track);
-    }
-
-    if (sizingData.filteredTracks.isEmpty())
-        return;
-
-    LayoutUnit additionalBreadthSpace = (this->*sizingFunction)(gridItem, direction, sizingData.columnTracks);
-    for (GridResolvedPosition trackIndexForSpace = initialTrackPosition; trackIndexForSpace <= finalTrackPosition; ++trackIndexForSpace) {
-        GridTrack& track = (direction == ForColumns) ? sizingData.columnTracks[trackIndexForSpace.toInt()] : sizingData.rowTracks[trackIndexForSpace.toInt()];
-        additionalBreadthSpace -= (track.*trackGetter)();
-    }
-
-    // FIXME: We should pass different values for |tracksForGrowthAboveMaxBreadth|.
-
-    // Specs mandate to floor additionalBreadthSpace (extra-space in specs) to 0. Instead we directly avoid the function
-    // call in those cases as it will be a noop in terms of track sizing.
-    if (additionalBreadthSpace > 0)
-        distributeSpaceToTracks(sizingData.filteredTracks, &sizingData.filteredTracks, trackGetter, trackGrowthFunction, sizingData, additionalBreadthSpace);
-}
-
-static bool sortByGridTrackGrowthPotential(const GridTrack* track1, const GridTrack* track2)
-{
-    if (track1->m_maxBreadth == infinity)
-        return track2->m_maxBreadth == infinity;
-
-    if (track2->m_maxBreadth == infinity)
-        return true;
-
-    return (track1->m_maxBreadth - track1->m_usedBreadth) < (track2->m_maxBreadth - track2->m_usedBreadth);
-}
-
-void RenderGrid::distributeSpaceToTracks(Vector<GridTrack*>& tracks, Vector<GridTrack*>* tracksForGrowthAboveMaxBreadth, AccumulatorGetter trackGetter, AccumulatorGrowFunction trackGrowthFunction, GridSizingData& sizingData, LayoutUnit& availableLogicalSpace)
-{
-    ASSERT(availableLogicalSpace > 0);
-    std::sort(tracks.begin(), tracks.end(), sortByGridTrackGrowthPotential);
-
-    size_t tracksSize = tracks.size();
-    sizingData.distributeTrackVector.resize(tracksSize);
-
-    for (size_t i = 0; i < tracksSize; ++i) {
-        GridTrack& track = *tracks[i];
-        LayoutUnit availableLogicalSpaceShare = availableLogicalSpace / (tracksSize - i);
-        LayoutUnit trackBreadth = (tracks[i]->*trackGetter)();
-        LayoutUnit growthShare = track.m_maxBreadth == infinity ? availableLogicalSpaceShare : std::min(availableLogicalSpaceShare, track.m_maxBreadth - trackBreadth);
-        ASSERT(growthShare != infinity);
-        sizingData.distributeTrackVector[i] = trackBreadth;
-        // We should never shrink any grid track or else we can't guarantee we abide by our min-sizing function.
-        if (growthShare > 0) {
-            sizingData.distributeTrackVector[i] += growthShare;
-            availableLogicalSpace -= growthShare;
-        }
-    }
-
-    if (availableLogicalSpace > 0 && tracksForGrowthAboveMaxBreadth) {
-        tracksSize = tracksForGrowthAboveMaxBreadth->size();
-        for (size_t i = 0; i < tracksSize; ++i) {
-            LayoutUnit growthShare = availableLogicalSpace / (tracksSize - i);
-            sizingData.distributeTrackVector[i] += growthShare;
-            availableLogicalSpace -= growthShare;
-        }
-    }
-
-    for (size_t i = 0; i < tracksSize; ++i) {
-        LayoutUnit growth = sizingData.distributeTrackVector[i] - (tracks[i]->*trackGetter)();
-        if (growth >= 0)
-            (tracks[i]->*trackGrowthFunction)(growth);
-    }
-}
-
-#if ENABLE(ASSERT)
-bool RenderGrid::tracksAreWiderThanMinTrackBreadth(GridTrackSizingDirection direction, const Vector<GridTrack>& tracks)
-{
-    for (size_t i = 0; i < tracks.size(); ++i) {
-        const GridTrackSize& trackSize = gridTrackSize(direction, i);
-        const GridLength& minTrackBreadth = trackSize.minTrackBreadth();
-        if (computeUsedBreadthOfMinLength(direction, minTrackBreadth) > tracks[i].m_usedBreadth)
-            return false;
-    }
-    return true;
-}
-#endif
-
-void RenderGrid::ensureGridSize(size_t maximumRowIndex, size_t maximumColumnIndex)
-{
-    const size_t oldRowSize = gridRowCount();
-    if (maximumRowIndex >= oldRowSize) {
-        m_grid.grow(maximumRowIndex + 1);
-        for (size_t row = oldRowSize; row < gridRowCount(); ++row)
-            m_grid[row].grow(gridColumnCount());
-    }
-
-    if (maximumColumnIndex >= gridColumnCount()) {
-        for (size_t row = 0; row < gridRowCount(); ++row)
-            m_grid[row].grow(maximumColumnIndex + 1);
-    }
-}
-
-void RenderGrid::insertItemIntoGrid(RenderBox* child, const GridCoordinate& coordinate)
-{
-    ensureGridSize(coordinate.rows.resolvedFinalPosition.toInt(), coordinate.columns.resolvedFinalPosition.toInt());
-
-    for (GridSpan::iterator row = coordinate.rows.begin(); row != coordinate.rows.end(); ++row) {
-        for (GridSpan::iterator column = coordinate.columns.begin(); column != coordinate.columns.end(); ++column)
-            m_grid[row.toInt()][column.toInt()].append(child);
-    }
-
-    RELEASE_ASSERT(!m_gridItemCoordinate.contains(child));
-    m_gridItemCoordinate.set(child, coordinate);
-}
-
-void RenderGrid::placeItemsOnGrid()
-{
-    if (!gridIsDirty())
-        return;
-
-    ASSERT(m_gridItemCoordinate.isEmpty());
-
-    populateExplicitGridAndOrderIterator();
-
-    // We clear the dirty bit here as the grid sizes have been updated, this means
-    // that we can safely call gridRowCount() / gridColumnCount().
-    m_gridIsDirty = false;
-
-    Vector<RenderBox*> autoMajorAxisAutoGridItems;
-    Vector<RenderBox*> specifiedMajorAxisAutoGridItems;
-    for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next()) {
-        // FIXME: We never re-resolve positions if the grid is grown during auto-placement which may lead auto / <integer>
-        // positions to not match the author's intent. The specification is unclear on what should be done in this case.
-        OwnPtr<GridSpan> rowPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *child, ForRows);
-        OwnPtr<GridSpan> columnPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *child, ForColumns);
-        if (!rowPositions || !columnPositions) {
-            GridSpan* majorAxisPositions = (autoPlacementMajorAxisDirection() == ForColumns) ? columnPositions.get() : rowPositions.get();
-            if (!majorAxisPositions)
-                autoMajorAxisAutoGridItems.append(child);
-            else
-                specifiedMajorAxisAutoGridItems.append(child);
-            continue;
-        }
-        insertItemIntoGrid(child, GridCoordinate(*rowPositions, *columnPositions));
-    }
-
-    ASSERT(gridRowCount() >= style()->gridTemplateRows().size());
-    ASSERT(gridColumnCount() >= style()->gridTemplateColumns().size());
-
-    // FIXME: Implement properly "stack" value in auto-placement algorithm.
-    if (style()->isGridAutoFlowAlgorithmStack()) {
-        // If we did collect some grid items, they won't be placed thus never laid out.
-        ASSERT(!autoMajorAxisAutoGridItems.size());
-        ASSERT(!specifiedMajorAxisAutoGridItems.size());
-        return;
-    }
-
-    placeSpecifiedMajorAxisItemsOnGrid(specifiedMajorAxisAutoGridItems);
-    placeAutoMajorAxisItemsOnGrid(autoMajorAxisAutoGridItems);
-
-    m_grid.shrinkToFit();
-}
-
-void RenderGrid::populateExplicitGridAndOrderIterator()
-{
-    OrderIteratorPopulator populator(m_orderIterator);
-
-    size_t maximumRowIndex = std::max<size_t>(1, GridResolvedPosition::explicitGridRowCount(*style()));
-    size_t maximumColumnIndex = std::max<size_t>(1, GridResolvedPosition::explicitGridColumnCount(*style()));
-
-    ASSERT(m_gridItemsIndexesMap.isEmpty());
-    size_t childIndex = 0;
-    for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
-        populator.collectChild(child);
-        m_gridItemsIndexesMap.set(child, childIndex++);
-
-        // This function bypasses the cache (cachedGridCoordinate()) as it is used to build it.
-        OwnPtr<GridSpan> rowPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *child, ForRows);
-        OwnPtr<GridSpan> columnPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *child, ForColumns);
-
-        // |positions| is 0 if we need to run the auto-placement algorithm.
-        if (rowPositions) {
-            maximumRowIndex = std::max<size_t>(maximumRowIndex, rowPositions->resolvedFinalPosition.next().toInt());
-        } else {
-            // Grow the grid for items with a definite row span, getting the largest such span.
-            GridSpan positions = GridResolvedPosition::resolveGridPositionsFromAutoPlacementPosition(*style(), *child, ForRows, GridResolvedPosition(0));
-            maximumRowIndex = std::max<size_t>(maximumRowIndex, positions.resolvedFinalPosition.next().toInt());
-        }
-
-        if (columnPositions) {
-            maximumColumnIndex = std::max<size_t>(maximumColumnIndex, columnPositions->resolvedFinalPosition.next().toInt());
-        } else {
-            // Grow the grid for items with a definite column span, getting the largest such span.
-            GridSpan positions = GridResolvedPosition::resolveGridPositionsFromAutoPlacementPosition(*style(), *child, ForColumns, GridResolvedPosition(0));
-            maximumColumnIndex = std::max<size_t>(maximumColumnIndex, positions.resolvedFinalPosition.next().toInt());
-        }
-    }
-
-    m_grid.grow(maximumRowIndex);
-    for (size_t i = 0; i < m_grid.size(); ++i)
-        m_grid[i].grow(maximumColumnIndex);
-}
-
-PassOwnPtr<GridCoordinate> RenderGrid::createEmptyGridAreaAtSpecifiedPositionsOutsideGrid(const RenderBox* gridItem, GridTrackSizingDirection specifiedDirection, const GridSpan& specifiedPositions) const
-{
-    GridTrackSizingDirection crossDirection = specifiedDirection == ForColumns ? ForRows : ForColumns;
-    const size_t endOfCrossDirection = crossDirection == ForColumns ? gridColumnCount() : gridRowCount();
-    GridSpan crossDirectionPositions = GridResolvedPosition::resolveGridPositionsFromAutoPlacementPosition(*style(), *gridItem, crossDirection, GridResolvedPosition(endOfCrossDirection));
-    return adoptPtr(new GridCoordinate(specifiedDirection == ForColumns ? crossDirectionPositions : specifiedPositions, specifiedDirection == ForColumns ? specifiedPositions : crossDirectionPositions));
-}
-
-void RenderGrid::placeSpecifiedMajorAxisItemsOnGrid(const Vector<RenderBox*>& autoGridItems)
-{
-    for (size_t i = 0; i < autoGridItems.size(); ++i) {
-        OwnPtr<GridSpan> majorAxisPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *autoGridItems[i], autoPlacementMajorAxisDirection());
-        GridSpan minorAxisPositions = GridResolvedPosition::resolveGridPositionsFromAutoPlacementPosition(*style(), *autoGridItems[i], autoPlacementMinorAxisDirection(), GridResolvedPosition(0));
-
-        GridIterator iterator(m_grid, autoPlacementMajorAxisDirection(), majorAxisPositions->resolvedInitialPosition.toInt());
-        OwnPtr<GridCoordinate> emptyGridArea = iterator.nextEmptyGridArea(majorAxisPositions->integerSpan(), minorAxisPositions.integerSpan());
-        if (!emptyGridArea)
-            emptyGridArea = createEmptyGridAreaAtSpecifiedPositionsOutsideGrid(autoGridItems[i], autoPlacementMajorAxisDirection(), *majorAxisPositions);
-        insertItemIntoGrid(autoGridItems[i], *emptyGridArea);
-    }
-}
-
-void RenderGrid::placeAutoMajorAxisItemsOnGrid(const Vector<RenderBox*>& autoGridItems)
-{
-    std::pair<size_t, size_t> autoPlacementCursor = std::make_pair(0, 0);
-    bool isGridAutoFlowDense = style()->isGridAutoFlowAlgorithmDense();
-
-    for (size_t i = 0; i < autoGridItems.size(); ++i) {
-        placeAutoMajorAxisItemOnGrid(autoGridItems[i], autoPlacementCursor);
-
-        // If grid-auto-flow is dense, reset auto-placement cursor.
-        if (isGridAutoFlowDense) {
-            autoPlacementCursor.first = 0;
-            autoPlacementCursor.second = 0;
-        }
-    }
-}
-
-void RenderGrid::placeAutoMajorAxisItemOnGrid(RenderBox* gridItem, std::pair<size_t, size_t>& autoPlacementCursor)
-{
-    OwnPtr<GridSpan> minorAxisPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *gridItem, autoPlacementMinorAxisDirection());
-    ASSERT(!GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *gridItem, autoPlacementMajorAxisDirection()));
-    GridSpan majorAxisPositions = GridResolvedPosition::resolveGridPositionsFromAutoPlacementPosition(*style(), *gridItem, autoPlacementMajorAxisDirection(), GridResolvedPosition(0));
-
-    const size_t endOfMajorAxis = (autoPlacementMajorAxisDirection() == ForColumns) ? gridColumnCount() : gridRowCount();
-    size_t majorAxisAutoPlacementCursor = autoPlacementMajorAxisDirection() == ForColumns ? autoPlacementCursor.second : autoPlacementCursor.first;
-    size_t minorAxisAutoPlacementCursor = autoPlacementMajorAxisDirection() == ForColumns ? autoPlacementCursor.first : autoPlacementCursor.second;
-
-    OwnPtr<GridCoordinate> emptyGridArea;
-    if (minorAxisPositions) {
-        // Move to the next track in major axis if initial position in minor axis is before auto-placement cursor.
-        if (minorAxisPositions->resolvedInitialPosition.toInt() < minorAxisAutoPlacementCursor)
-            majorAxisAutoPlacementCursor++;
-
-        if (majorAxisAutoPlacementCursor < endOfMajorAxis) {
-            GridIterator iterator(m_grid, autoPlacementMinorAxisDirection(), minorAxisPositions->resolvedInitialPosition.toInt(), majorAxisAutoPlacementCursor);
-            emptyGridArea = iterator.nextEmptyGridArea(minorAxisPositions->integerSpan(), majorAxisPositions.integerSpan());
-        }
-
-        if (!emptyGridArea)
-            emptyGridArea = createEmptyGridAreaAtSpecifiedPositionsOutsideGrid(gridItem, autoPlacementMinorAxisDirection(), *minorAxisPositions);
-    } else {
-        GridSpan minorAxisPositions = GridResolvedPosition::resolveGridPositionsFromAutoPlacementPosition(*style(), *gridItem, autoPlacementMinorAxisDirection(), GridResolvedPosition(0));
-
-        for (size_t majorAxisIndex = majorAxisAutoPlacementCursor; majorAxisIndex < endOfMajorAxis; ++majorAxisIndex) {
-            GridIterator iterator(m_grid, autoPlacementMajorAxisDirection(), majorAxisIndex, minorAxisAutoPlacementCursor);
-            emptyGridArea = iterator.nextEmptyGridArea(majorAxisPositions.integerSpan(), minorAxisPositions.integerSpan());
-
-            if (emptyGridArea) {
-                // Check that it fits in the minor axis direction, as we shouldn't grow in that direction here (it was already managed in populateExplicitGridAndOrderIterator()).
-                GridResolvedPosition minorAxisFinalPositionIndex = autoPlacementMinorAxisDirection() == ForColumns ? emptyGridArea->columns.resolvedFinalPosition : emptyGridArea->rows.resolvedFinalPosition;
-                const size_t endOfMinorAxis = autoPlacementMinorAxisDirection() == ForColumns ? gridColumnCount() : gridRowCount();
-                if (minorAxisFinalPositionIndex.toInt() < endOfMinorAxis)
-                    break;
-
-                // Discard empty grid area as it does not fit in the minor axis direction.
-                // We don't need to create a new empty grid area yet as we might find a valid one in the next iteration.
-                emptyGridArea = nullptr;
-            }
-
-            // As we're moving to the next track in the major axis we should reset the auto-placement cursor in the minor axis.
-            minorAxisAutoPlacementCursor = 0;
-        }
-
-        if (!emptyGridArea)
-            emptyGridArea = createEmptyGridAreaAtSpecifiedPositionsOutsideGrid(gridItem, autoPlacementMinorAxisDirection(), minorAxisPositions);
-    }
-
-    insertItemIntoGrid(gridItem, *emptyGridArea);
-    // Move auto-placement cursor to the new position.
-    autoPlacementCursor.first = emptyGridArea->rows.resolvedInitialPosition.toInt();
-    autoPlacementCursor.second = emptyGridArea->columns.resolvedInitialPosition.toInt();
-}
-
-GridTrackSizingDirection RenderGrid::autoPlacementMajorAxisDirection() const
-{
-    return style()->isGridAutoFlowDirectionColumn() ? ForColumns : ForRows;
-}
-
-GridTrackSizingDirection RenderGrid::autoPlacementMinorAxisDirection() const
-{
-    return style()->isGridAutoFlowDirectionColumn() ? ForRows : ForColumns;
-}
-
-void RenderGrid::dirtyGrid()
-{
-    m_grid.resize(0);
-    m_gridItemCoordinate.clear();
-    m_gridIsDirty = true;
-    m_gridItemsOverflowingGridArea.resize(0);
-    m_gridItemsIndexesMap.clear();
-}
-
-void RenderGrid::layoutGridItems()
-{
-    placeItemsOnGrid();
-
-    GridSizingData sizingData(gridColumnCount(), gridRowCount());
-    computeUsedBreadthOfGridTracks(ForColumns, sizingData);
-    ASSERT(tracksAreWiderThanMinTrackBreadth(ForColumns, sizingData.columnTracks));
-    computeUsedBreadthOfGridTracks(ForRows, sizingData);
-    ASSERT(tracksAreWiderThanMinTrackBreadth(ForRows, sizingData.rowTracks));
-
-    populateGridPositions(sizingData);
-    m_gridItemsOverflowingGridArea.resize(0);
-
-    for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
-        // Because the grid area cannot be styled, we don't need to adjust
-        // the grid breadth to account for 'box-sizing'.
-        LayoutUnit oldOverrideContainingBlockContentLogicalWidth = child->hasOverrideContainingBlockLogicalWidth() ? child->overrideContainingBlockContentLogicalWidth() : LayoutUnit();
-        LayoutUnit oldOverrideContainingBlockContentLogicalHeight = child->hasOverrideContainingBlockLogicalHeight() ? child->overrideContainingBlockContentLogicalHeight() : LayoutUnit();
-
-        LayoutUnit overrideContainingBlockContentLogicalWidth = gridAreaBreadthForChild(child, ForColumns, sizingData.columnTracks);
-        LayoutUnit overrideContainingBlockContentLogicalHeight = gridAreaBreadthForChild(child, ForRows, sizingData.rowTracks);
-
-        SubtreeLayoutScope layoutScope(*child);
-        if (oldOverrideContainingBlockContentLogicalWidth != overrideContainingBlockContentLogicalWidth || (oldOverrideContainingBlockContentLogicalHeight != overrideContainingBlockContentLogicalHeight && child->hasRelativeLogicalHeight()))
-            layoutScope.setNeedsLayout(child);
-
-        child->setOverrideContainingBlockContentLogicalWidth(overrideContainingBlockContentLogicalWidth);
-        child->setOverrideContainingBlockContentLogicalHeight(overrideContainingBlockContentLogicalHeight);
-
-        // FIXME: Grid items should stretch to fill their cells. Once we
-        // implement grid-{column,row}-align, we can also shrink to fit. For
-        // now, just size as if we were a regular child.
-        child->layoutIfNeeded();
-
-#if ENABLE(ASSERT)
-        const GridCoordinate& coordinate = cachedGridCoordinate(child);
-        ASSERT(coordinate.columns.resolvedInitialPosition.toInt() < sizingData.columnTracks.size());
-        ASSERT(coordinate.rows.resolvedInitialPosition.toInt() < sizingData.rowTracks.size());
-#endif
-        child->setLogicalLocation(findChildLogicalPosition(child));
-
-        // Keep track of children overflowing their grid area as we might need to paint them even if the grid-area is
-        // not visible
-        if (child->logicalHeight() > overrideContainingBlockContentLogicalHeight
-            || child->logicalWidth() > overrideContainingBlockContentLogicalWidth)
-            m_gridItemsOverflowingGridArea.append(child);
-    }
-
-    for (size_t i = 0; i < sizingData.rowTracks.size(); ++i)
-        setLogicalHeight(logicalHeight() + sizingData.rowTracks[i].m_usedBreadth);
-
-    // Min / max logical height is handled by the call to updateLogicalHeight in layoutBlock.
-
-    setLogicalHeight(logicalHeight() + borderAndPaddingLogicalHeight());
-}
-
-GridCoordinate RenderGrid::cachedGridCoordinate(const RenderBox* gridItem) const
-{
-    ASSERT(m_gridItemCoordinate.contains(gridItem));
-    return m_gridItemCoordinate.get(gridItem);
-}
-
-LayoutUnit RenderGrid::gridAreaBreadthForChild(const RenderBox* child, GridTrackSizingDirection direction, const Vector<GridTrack>& tracks) const
-{
-    const GridCoordinate& coordinate = cachedGridCoordinate(child);
-    const GridSpan& span = (direction == ForColumns) ? coordinate.columns : coordinate.rows;
-    LayoutUnit gridAreaBreadth = 0;
-    for (GridSpan::iterator trackPosition = span.begin(); trackPosition != span.end(); ++trackPosition)
-        gridAreaBreadth += tracks[trackPosition.toInt()].m_usedBreadth;
-    return gridAreaBreadth;
-}
-
-void RenderGrid::populateGridPositions(const GridSizingData& sizingData)
-{
-    m_columnPositions.resize(sizingData.columnTracks.size() + 1);
-    m_columnPositions[0] = borderAndPaddingStart();
-    for (size_t i = 0; i < m_columnPositions.size() - 1; ++i)
-        m_columnPositions[i + 1] = m_columnPositions[i] + sizingData.columnTracks[i].m_usedBreadth;
-
-    m_rowPositions.resize(sizingData.rowTracks.size() + 1);
-    m_rowPositions[0] = borderAndPaddingBefore();
-    for (size_t i = 0; i < m_rowPositions.size() - 1; ++i)
-        m_rowPositions[i + 1] = m_rowPositions[i] + sizingData.rowTracks[i].m_usedBreadth;
-}
-
-LayoutUnit RenderGrid::startOfColumnForChild(const RenderBox* child) const
-{
-    const GridCoordinate& coordinate = cachedGridCoordinate(child);
-    LayoutUnit startOfColumn = m_columnPositions[coordinate.columns.resolvedInitialPosition.toInt()];
-    // The grid items should be inside the grid container's border box, that's why they need to be shifted.
-    // FIXME: This should account for the grid item's <overflow-position>.
-    return startOfColumn + marginStartForChild(child);
-}
-
-LayoutUnit RenderGrid::endOfColumnForChild(const RenderBox* child) const
-{
-    const GridCoordinate& coordinate = cachedGridCoordinate(child);
-    LayoutUnit startOfColumn = m_columnPositions[coordinate.columns.resolvedInitialPosition.toInt()];
-    // The grid items should be inside the grid container's border box, that's why they need to be shifted.
-    LayoutUnit columnPosition = startOfColumn + marginStartForChild(child);
-
-    LayoutUnit endOfColumn = m_columnPositions[coordinate.columns.resolvedFinalPosition.next().toInt()];
-    // FIXME: This should account for the grid item's <overflow-position>.
-    return columnPosition + std::max<LayoutUnit>(0, endOfColumn - m_columnPositions[coordinate.columns.resolvedInitialPosition.toInt()] - child->logicalWidth());
-}
-
-LayoutUnit RenderGrid::columnPositionAlignedWithGridContainerStart(const RenderBox* child) const
-{
-    if (style()->isLeftToRightDirection())
-        return startOfColumnForChild(child);
-
-    return endOfColumnForChild(child);
-}
-
-LayoutUnit RenderGrid::columnPositionAlignedWithGridContainerEnd(const RenderBox* child) const
-{
-    if (!style()->isLeftToRightDirection())
-        return startOfColumnForChild(child);
-
-    return endOfColumnForChild(child);
-}
-
-LayoutUnit RenderGrid::centeredColumnPositionForChild(const RenderBox* child) const
-{
-    const GridCoordinate& coordinate = cachedGridCoordinate(child);
-    LayoutUnit startOfColumn = m_columnPositions[coordinate.columns.resolvedInitialPosition.toInt()];
-    LayoutUnit endOfColumn = m_columnPositions[coordinate.columns.resolvedFinalPosition.next().toInt()];
-    LayoutUnit columnPosition = startOfColumn + marginStartForChild(child);
-    // FIXME: This should account for the grid item's <overflow-position>.
-    return columnPosition + std::max<LayoutUnit>(0, endOfColumn - startOfColumn - child->logicalWidth()) / 2;
-}
-
-static ItemPosition resolveJustification(const RenderStyle* parentStyle, const RenderStyle* childStyle)
-{
-    ItemPosition justify = childStyle->justifySelf();
-    if (justify == ItemPositionAuto)
-        justify = (parentStyle->justifyItems() == ItemPositionAuto) ? ItemPositionStretch : parentStyle->justifyItems();
-
-    return justify;
-}
-
-LayoutUnit RenderGrid::columnPositionForChild(const RenderBox* child) const
-{
-    switch (resolveJustification(style(), child->style())) {
-    case ItemPositionSelfStart:
-        // self-start is based on the child's direction. That's why we need to check against the grid container's direction.
-        if (child->style()->direction() != style()->direction())
-            return columnPositionAlignedWithGridContainerEnd(child);
-
-        return columnPositionAlignedWithGridContainerStart(child);
-    case ItemPositionSelfEnd:
-        // self-end is based on the child's direction. That's why we need to check against the grid container's direction.
-        if (child->style()->direction() != style()->direction())
-            return columnPositionAlignedWithGridContainerStart(child);
-
-        return columnPositionAlignedWithGridContainerEnd(child);
-
-    case ItemPositionFlexStart:
-        // Only used in flex layout, for other layout, it's equivalent to 'start'.
-        return columnPositionAlignedWithGridContainerStart(child);
-    case ItemPositionFlexEnd:
-        // Only used in flex layout, for other layout, it's equivalent to 'start'.
-        return columnPositionAlignedWithGridContainerEnd(child);
-
-    case ItemPositionLeft:
-        if (style()->isLeftToRightDirection())
-            return columnPositionAlignedWithGridContainerStart(child);
-
-        return columnPositionAlignedWithGridContainerEnd(child);
-    case ItemPositionRight:
-        if (style()->isLeftToRightDirection())
-            return columnPositionAlignedWithGridContainerEnd(child);
-
-        return columnPositionAlignedWithGridContainerStart(child);
-
-    case ItemPositionCenter:
-        return centeredColumnPositionForChild(child);
-    case ItemPositionStart:
-        return columnPositionAlignedWithGridContainerStart(child);
-    case ItemPositionEnd:
-        return columnPositionAlignedWithGridContainerEnd(child);
-
-    case ItemPositionAuto:
-        break;
-    case ItemPositionStretch:
-    case ItemPositionBaseline:
-    case ItemPositionLastBaseline:
-        // FIXME: Implement the previous values. For now, we always start align the child.
-        return startOfColumnForChild(child);
-    }
-
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
-LayoutUnit RenderGrid::endOfRowForChild(const RenderBox* child) const
-{
-    const GridCoordinate& coordinate = cachedGridCoordinate(child);
-
-    LayoutUnit startOfRow = m_rowPositions[coordinate.rows.resolvedInitialPosition.toInt()];
-    // The grid items should be inside the grid container's border box, that's why they need to be shifted.
-    LayoutUnit rowPosition = startOfRow + marginBeforeForChild(child);
-
-    LayoutUnit endOfRow = m_rowPositions[coordinate.rows.resolvedFinalPosition.next().toInt()];
-    // FIXME: This should account for the grid item's <overflow-position>.
-    return rowPosition + std::max<LayoutUnit>(0, endOfRow - startOfRow - child->logicalHeight());
-}
-
-LayoutUnit RenderGrid::startOfRowForChild(const RenderBox* child) const
-{
-    const GridCoordinate& coordinate = cachedGridCoordinate(child);
-
-    LayoutUnit startOfRow = m_rowPositions[coordinate.rows.resolvedInitialPosition.toInt()];
-    // The grid items should be inside the grid container's border box, that's why they need to be shifted.
-    // FIXME: This should account for the grid item's <overflow-position>.
-    LayoutUnit rowPosition = startOfRow + marginBeforeForChild(child);
-
-    return rowPosition;
-}
-
-LayoutUnit RenderGrid::centeredRowPositionForChild(const RenderBox* child) const
-{
-    const GridCoordinate& coordinate = cachedGridCoordinate(child);
-
-    // The grid items should be inside the grid container's border box, that's why they need to be shifted.
-    LayoutUnit startOfRow = m_rowPositions[coordinate.rows.resolvedInitialPosition.toInt()] + marginBeforeForChild(child);
-    LayoutUnit endOfRow = m_rowPositions[coordinate.rows.resolvedFinalPosition.next().toInt()];
-
-    // FIXME: This should account for the grid item's <overflow-position>.
-    return startOfRow + std::max<LayoutUnit>(0, endOfRow - startOfRow - child->logicalHeight()) / 2;
-}
-
-// FIXME: We should move this logic to the StyleAdjuster or the StyleBuilder.
-static ItemPosition resolveAlignment(const RenderStyle* parentStyle, const RenderStyle* childStyle)
-{
-    ItemPosition align = childStyle->alignSelf();
-    // The auto keyword computes to the parent's align-items computed value, or to "stretch", if not set or "auto".
-    if (align == ItemPositionAuto)
-        align = (parentStyle->alignItems() == ItemPositionAuto) ? ItemPositionStretch : parentStyle->alignItems();
-    return align;
-}
-
-LayoutUnit RenderGrid::rowPositionForChild(const RenderBox* child) const
-{
-    ItemPosition alignSelf = resolveAlignment(style(), child->style());
-
-    switch (alignSelf) {
-    case ItemPositionSelfStart:
-        return startOfRowForChild(child);
-    case ItemPositionSelfEnd:
-        return endOfRowForChild(child);
-
-    case ItemPositionLeft:
-        // orthogonal modes make property and inline axes to be parallel, but in any case
-        // this is always equivalent to 'Start'.
-        //
-        // self-align's axis is never parallel to the inline axis, except in orthogonal
-        // writing-mode, so this is equivalent to 'Start’.
-        return startOfRowForChild(child);
-
-    case ItemPositionRight:
-        // self-align's axis is never parallel to the inline axis, except in orthogonal
-        // writing-mode, so this is equivalent to 'Start'.
-        return startOfRowForChild(child);
-
-    case ItemPositionCenter:
-        return centeredRowPositionForChild(child);
-        // Only used in flex layout, for other layout, it's equivalent to 'Start'.
-    case ItemPositionFlexStart:
-    case ItemPositionStart:
-        return startOfRowForChild(child);
-        // Only used in flex layout, for other layout, it's equivalent to 'End'.
-    case ItemPositionFlexEnd:
-    case ItemPositionEnd:
-        return endOfRowForChild(child);
-    case ItemPositionStretch:
-        // FIXME: Implement the Stretch value. For now, we always start align the child.
-        return startOfRowForChild(child);
-    case ItemPositionBaseline:
-    case ItemPositionLastBaseline:
-        // FIXME: Implement the ItemPositionBaseline value. For now, we always start align the child.
-        return startOfRowForChild(child);
-    case ItemPositionAuto:
-        break;
-    }
-
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
-LayoutPoint RenderGrid::findChildLogicalPosition(const RenderBox* child) const
-{
-    return LayoutPoint(columnPositionForChild(child), rowPositionForChild(child));
-}
-
-static GridSpan dirtiedGridAreas(const Vector<LayoutUnit>& coordinates, LayoutUnit start, LayoutUnit end)
-{
-    // This function does a binary search over the coordinates.
-    // This doesn't work with grid items overflowing their grid areas, but that is managed with m_gridItemsOverflowingGridArea.
-
-    size_t startGridAreaIndex = std::upper_bound(coordinates.begin(), coordinates.end() - 1, start) - coordinates.begin();
-    if (startGridAreaIndex > 0)
-        --startGridAreaIndex;
-
-    size_t endGridAreaIndex = std::upper_bound(coordinates.begin() + startGridAreaIndex, coordinates.end() - 1, end) - coordinates.begin();
-    if (endGridAreaIndex > 0)
-        --endGridAreaIndex;
-
-    return GridSpan(startGridAreaIndex, endGridAreaIndex);
-}
-
-class GridItemsSorter {
-public:
-    bool operator()(const std::pair<RenderBox*, size_t>& firstChild, const std::pair<RenderBox*, size_t>& secondChild) const
-    {
-        if (firstChild.first->style()->order() != secondChild.first->style()->order())
-            return firstChild.first->style()->order() < secondChild.first->style()->order();
-
-        return firstChild.second < secondChild.second;
-    }
-};
-
-void RenderGrid::paintChildren(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!gridIsDirty());
-
-    LayoutRect localPaintInvalidationRect = paintInfo.rect;
-    localPaintInvalidationRect.moveBy(-paintOffset);
-
-    GridSpan dirtiedColumns = dirtiedGridAreas(m_columnPositions, localPaintInvalidationRect.x(), localPaintInvalidationRect.maxX());
-    GridSpan dirtiedRows = dirtiedGridAreas(m_rowPositions, localPaintInvalidationRect.y(), localPaintInvalidationRect.maxY());
-
-    Vector<std::pair<RenderBox*, size_t> > gridItemsToBePainted;
-
-    for (GridSpan::iterator row = dirtiedRows.begin(); row != dirtiedRows.end(); ++row) {
-        for (GridSpan::iterator column = dirtiedColumns.begin(); column != dirtiedColumns.end(); ++column) {
-            const Vector<RenderBox*, 1>& children = m_grid[row.toInt()][column.toInt()];
-            for (size_t j = 0; j < children.size(); ++j)
-                gridItemsToBePainted.append(std::make_pair(children[j], m_gridItemsIndexesMap.get(children[j])));
-        }
-    }
-
-    for (Vector<RenderBox*>::const_iterator it = m_gridItemsOverflowingGridArea.begin(); it != m_gridItemsOverflowingGridArea.end(); ++it) {
-        if ((*it)->frameRect().intersects(localPaintInvalidationRect))
-            gridItemsToBePainted.append(std::make_pair(*it, m_gridItemsIndexesMap.get(*it)));
-    }
-
-    // Sort grid items following order-modified document order.
-    // See http://www.w3.org/TR/css-flexbox/#order-modified-document-order
-    std::stable_sort(gridItemsToBePainted.begin(), gridItemsToBePainted.end(), GridItemsSorter());
-
-    RenderBox* previous = 0;
-    for (Vector<std::pair<RenderBox*, size_t> >::const_iterator it = gridItemsToBePainted.begin(); it != gridItemsToBePainted.end(); ++it) {
-        // We might have duplicates because of spanning children are included in all cells they span.
-        // Skip them here to avoid painting items several times.
-        RenderBox* current = (*it).first;
-        if (current == previous)
-            continue;
-
-        paintChild(current, paintInfo, paintOffset);
-        previous = current;
-    }
-}
-
-const char* RenderGrid::renderName() const
-{
-    if (isFloating())
-        return "RenderGrid (floating)";
-    if (isOutOfFlowPositioned())
-        return "RenderGrid (positioned)";
-    if (isAnonymous())
-        return "RenderGrid (generated)";
-    if (isRelPositioned())
-        return "RenderGrid (relative positioned)";
-    return "RenderGrid";
-}
-
-} // namespace blink