Add RenderObject::needsResizeLayout

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index 7ffb86cf19aca82d227df40ec668be67628ae97a..a90f130e736d6cd1d40447a0978229e46a945043 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -529,22 +529,41 @@ public:
 
     bool needsLayout() const
     {
-        return m_bitfields.selfNeedsLayout() || m_bitfields.normalChildNeedsLayout() || m_bitfields.posChildNeedsLayout()
-            || m_bitfields.needsSimplifiedNormalFlowLayout() || m_bitfields.needsPositionedMovementLayout();
+        return m_bitfields.selfNeedsLayout()
+            || m_bitfields.normalChildNeedsLayout()
+            || m_bitfields.posChildNeedsLayout()
+            || m_bitfields.needsSimplifiedNormalFlowLayout()
+            || m_bitfields.needsPositionedMovementLayout()
+            || m_bitfields.needsResizeLayout();
     }
 
     bool selfNeedsLayout() const { return m_bitfields.selfNeedsLayout(); }
     bool needsPositionedMovementLayout() const { return m_bitfields.needsPositionedMovementLayout(); }
     bool needsPositionedMovementLayoutOnly() const
     {
-        return m_bitfields.needsPositionedMovementLayout() && !m_bitfields.selfNeedsLayout() && !m_bitfields.normalChildNeedsLayout()
-            && !m_bitfields.posChildNeedsLayout() && !m_bitfields.needsSimplifiedNormalFlowLayout();
+        return m_bitfields.needsPositionedMovementLayout()
+            && !m_bitfields.selfNeedsLayout()
+            && !m_bitfields.normalChildNeedsLayout()
+            && !m_bitfields.posChildNeedsLayout()
+            && !m_bitfields.needsSimplifiedNormalFlowLayout()
+            && !m_bitfields.needsResizeLayout();
     }
 
     bool posChildNeedsLayout() const { return m_bitfields.posChildNeedsLayout(); }
     bool needsSimplifiedNormalFlowLayout() const { return m_bitfields.needsSimplifiedNormalFlowLayout(); }
     bool normalChildNeedsLayout() const { return m_bitfields.normalChildNeedsLayout(); }
 
+    bool needsResizeLayout() const { return m_bitfields.needsResizeLayout(); }
+    bool needsResizeLayoutOnly() const
+    {
+        return m_bitfields.needsResizeLayout()
+            && !m_bitfields.selfNeedsLayout()
+            && !m_bitfields.normalChildNeedsLayout()
+            && !m_bitfields.posChildNeedsLayout()
+            && !m_bitfields.needsSimplifiedNormalFlowLayout()
+            && !m_bitfields.needsPositionedMovementLayout();
+    }
+
     bool preferredLogicalWidthsDirty() const { return m_bitfields.preferredLogicalWidthsDirty(); }
 
     bool isSelectionBorder() const;
@@ -616,6 +635,7 @@ public:
     void setChildNeedsLayout(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
     void setNeedsPositionedMovementLayout();
     void setNeedsSimplifiedNormalFlowLayout();
+    void setNeedsResizeLayout();
     void setPreferredLogicalWidthsDirty(MarkingBehavior = MarkContainingBlockChain);
     void clearPreferredLogicalWidthsDirty();
     void invalidateContainerPreferredLogicalWidths();
@@ -1115,6 +1135,7 @@ private:
             , m_normalChildNeedsLayout(false)
             , m_posChildNeedsLayout(false)
             , m_needsSimplifiedNormalFlowLayout(false)
+            , m_needsResizeLayout(false)
             , m_preferredLogicalWidthsDirty(false)
             , m_floating(false)
             , m_isAnonymous(!node)
@@ -1152,6 +1173,7 @@ private:
         ADD_BOOLEAN_BITFIELD(normalChildNeedsLayout, NormalChildNeedsLayout);
         ADD_BOOLEAN_BITFIELD(posChildNeedsLayout, PosChildNeedsLayout);
         ADD_BOOLEAN_BITFIELD(needsSimplifiedNormalFlowLayout, NeedsSimplifiedNormalFlowLayout);
+        ADD_BOOLEAN_BITFIELD(needsResizeLayout, NeedsResizeLayout);

[eseidel, 2014/04/01 18:25:19]

Presumably we have space for this otherwise the KeepRenderObjectSmall
COMPILE_ASSERT would fail?

         ADD_BOOLEAN_BITFIELD(preferredLogicalWidthsDirty, PreferredLogicalWidthsDirty);
         ADD_BOOLEAN_BITFIELD(floating, Floating);
 
@@ -1219,6 +1241,7 @@ private:
     void setNormalChildNeedsLayout(bool b) { m_bitfields.setNormalChildNeedsLayout(b); }
     void setPosChildNeedsLayout(bool b) { m_bitfields.setPosChildNeedsLayout(b); }
     void setNeedsSimplifiedNormalFlowLayout(bool b) { m_bitfields.setNeedsSimplifiedNormalFlowLayout(b); }
+    void setNeedsResizeLayoutBit(bool b) { m_bitfields.setNeedsResizeLayout(b); }
     void setIsDragging(bool b) { m_bitfields.setIsDragging(b); }
     void setEverHadLayout(bool b) { m_bitfields.setEverHadLayout(b); }
     void setShouldRepaintOverflow(bool b) { m_bitfields.setShouldRepaintOverflow(b); }
@@ -1290,6 +1313,7 @@ inline void RenderObject::clearNeedsLayout()
     setNeedsSimplifiedNormalFlowLayout(false);
     setNormalChildNeedsLayout(false);
     setNeedsPositionedMovementLayout(false);
+    setNeedsResizeLayoutBit(false);
     setAncestorLineBoxDirty(false);
 #ifndef NDEBUG
     checkBlockPositionedObjectsNeedLayout();
@@ -1330,6 +1354,15 @@ inline void RenderObject::setNeedsSimplifiedNormalFlowLayout()
     }
 }
 
+inline void RenderObject::setNeedsResizeLayout()
+{
+    bool alreadyNeededLayout = needsResizeLayout();
+    setNeedsResizeLayoutBit(true);
+    ASSERT(!isSetNeedsLayoutForbidden());
+    if (!alreadyNeededLayout)
+        markContainingBlocksForLayout();
+}
+
 inline bool RenderObject::preservesNewline() const
 {
     if (isSVGInlineText())