Optimize for horizontal writing mode

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index 688af1cb760806023fb06db570ad475e39898d1e..0e4d901408282f30e092d06ad6a8fde4f87ac5f0 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -1338,7 +1338,7 @@ void RenderBlock::finishDelayUpdateScrollInfo()
 void RenderBlock::updateScrollInfoAfterLayout()
 {
     if (hasOverflowClip()) {
-        if (style()->isFlippedBlocksWritingMode()) {
+        if (style()->slowIsFlippedBlocksWritingMode()) {
             // FIXME: https://bugs.webkit.org/show_bug.cgi?id=97937
             // Workaround for now. We cannot delay the scroll info for overflow
             // for items with opposite writing directions, as the contents needs
@@ -2461,7 +2461,7 @@ public:
     ColumnRectIterator(const RenderBlock& block)
         : m_block(block)
         , m_colInfo(block.columnInfo())
-        , m_direction(m_block.style()->isFlippedBlocksWritingMode() ? 1 : -1)
+        , m_direction(m_block.style()->slowIsFlippedBlocksWritingMode() ? 1 : -1)
         , m_isHorizontal(block.isHorizontalWritingMode())
         , m_logicalLeft(block.logicalLeftOffsetForContent())
     {
@@ -2638,7 +2638,7 @@ PositionWithAffinity RenderBlock::positionForPointWithInlineChildren(const Layou
         return createPositionWithAffinity(0, DOWNSTREAM);
 
     bool linesAreFlipped = style()->isFlippedLinesWritingMode();
-    bool blocksAreFlipped = style()->isFlippedBlocksWritingMode();
+    bool blocksAreFlipped = style()->slowIsFlippedBlocksWritingMode();
 
     // look for the closest line box in the root box which is at the passed-in y coordinate
     InlineBox* closestBox = 0;
@@ -2756,7 +2756,7 @@ PositionWithAffinity RenderBlock::positionForPoint(const LayoutPoint& point)
     while (lastCandidateBox && !isChildHitTestCandidate(lastCandidateBox))
         lastCandidateBox = lastCandidateBox->previousSiblingBox();
 
-    bool blocksAreFlipped = style()->isFlippedBlocksWritingMode();
+    bool blocksAreFlipped = style()->slowIsFlippedBlocksWritingMode();
     if (lastCandidateBox) {
         if (pointInLogicalContents.y() > logicalTopForChild(lastCandidateBox)
             || (!blocksAreFlipped && pointInLogicalContents.y() == logicalTopForChild(lastCandidateBox)))
@@ -2969,9 +2969,9 @@ void RenderBlock::adjustPointToColumnContents(LayoutPoint& point) const
 
                 // We're inside the column.  Translate the x and y into our column coordinate space.
                 if (colInfo->progressionAxis() == ColumnInfo::InlineAxis)
-                    point.move(columnPoint.x() - colRect.x(), (!style()->isFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset));
+                    point.move(columnPoint.x() - colRect.x(), (!style()->slowIsFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset));
                 else
-                    point.move((!style()->isFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset) - colRect.x() + borderLeft() + paddingLeft(), 0);
+                    point.move((!style()->slowIsFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset) - colRect.x() + borderLeft() + paddingLeft(), 0);
                 return;
             }
 
@@ -3001,9 +3001,9 @@ void RenderBlock::adjustPointToColumnContents(LayoutPoint& point) const
 
                 // We're inside the column.  Translate the x and y into our column coordinate space.
                 if (colInfo->progressionAxis() == ColumnInfo::InlineAxis)
-                    point.move((!style()->isFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset), columnPoint.y() - colRect.y());
+                    point.move((!style()->slowIsFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset), columnPoint.y() - colRect.y());
                 else
-                    point.move(0, (!style()->isFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset) - colRect.y() + borderTop() + paddingTop());
+                    point.move(0, (!style()->slowIsFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset) - colRect.y() + borderTop() + paddingTop());
                 return;
             }
 
@@ -3075,7 +3075,7 @@ void RenderBlock::adjustRectForColumns(LayoutRect& r) const
 LayoutPoint RenderBlock::flipForWritingModeIncludingColumns(const LayoutPoint& point) const
 {
     ASSERT(hasColumns());
-    if (!hasColumns() || !style()->isFlippedBlocksWritingMode())
+    if (!hasColumns() || !style()->slowIsFlippedBlocksWritingMode())
         return point;
     ColumnInfo* colInfo = columnInfo();
     LayoutUnit columnLogicalHeight = colInfo->columnHeight();
@@ -3088,7 +3088,7 @@ LayoutPoint RenderBlock::flipForWritingModeIncludingColumns(const LayoutPoint& p
 void RenderBlock::adjustStartEdgeForWritingModeIncludingColumns(LayoutRect& rect) const
 {
     ASSERT(hasColumns());
-    if (!hasColumns() || !style()->isFlippedBlocksWritingMode())
+    if (!hasColumns() || !style()->slowIsFlippedBlocksWritingMode())
         return;
 
     ColumnInfo* colInfo = columnInfo();