[css-flexbox] Implement new abspos handling

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.h

Index: third_party/WebKit/Source/core/layout/LayoutFlexibleBox.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.h b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.h
index 96b647f5898b4b15ec3a8465ddd5439b7d768f75..da579835746e95018733786e6a59994654160f63 100644
--- a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.h
+++ b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.h
@@ -70,6 +70,16 @@ public:
     LayoutUnit childLogicalWidthForPercentageResolution(const LayoutBox& child);
 
     void clearCachedMainSizeForChild(const LayoutBox& child);
+
+    LayoutUnit staticMainAxisPositionForPositionedChild(const LayoutBox& child);
+    LayoutUnit staticCrossAxisPositionForPositionedChild(const LayoutBox& child);
+
+    LayoutUnit staticInlinePositionForPositionedChild(const LayoutBox& child);
+    LayoutUnit staticBlockPositionForPositionedChild(const LayoutBox& child);
+
+    // Returns true if the position changed. In that case, the child will have to be
+    // laid out again.
+    bool setStaticPositionForPositionedLayout(LayoutBox& child);
 protected:
     void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
 
@@ -82,11 +92,6 @@ private:
         NegativeFlexibility,
     };
 
-    enum PositionedLayoutMode {
-        FlipForRowReverse,
-        NoFlipForRowReverse,
-    };
-
     enum ChildLayoutType {
         LayoutIfNeeded,
         ForceLayout,
@@ -177,7 +182,7 @@ private:
 
     void resetAutoMarginsAndLogicalTopInCrossAxis(LayoutBox& child);
     void setOverrideMainAxisSizeForChild(LayoutBox& child, LayoutUnit childPreferredSize);
-    void prepareChildForPositionedLayout(LayoutBox& child, LayoutUnit mainAxisOffset, LayoutUnit crossAxisOffset, PositionedLayoutMode);
+    void prepareChildForPositionedLayout(LayoutBox& child);
     size_t numberOfInFlowPositionedChildren(const OrderedFlexItemList&) const;
     void layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, const OrderedFlexItemList&, const Vector<LayoutUnit, 16>& childSizes, LayoutUnit availableFreeSpace, bool relayoutChildren, SubtreeLayoutScope&, Vector<LineContext>&);
     void layoutColumnReverse(const OrderedFlexItemList&, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace);