Don't allow position:sticky for table columns.

Source/core/css/resolver/StyleAdjuster.cpp

Index: Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/Source/core/css/resolver/StyleAdjuster.cpp b/Source/core/css/resolver/StyleAdjuster.cpp
index 215d499af052796dcfadab339bcc6cb48c84e9c4..dc3fb601bf7d5d5a2689b080f5cb53713db16a92 100644
--- a/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/Source/core/css/resolver/StyleAdjuster.cpp
@@ -260,12 +260,16 @@ void StyleAdjuster::adjustRenderStyle(RenderStyle* style, RenderStyle* parentSty
         if (style->display() == INLINE && style->styleType() == NOPSEUDO && style->writingMode() != parentStyle->writingMode())
             style->setDisplay(INLINE_BLOCK);
 
-        // After performing the display mutation, check table rows. We do not honor position:relative or position:sticky on
-        // table rows or cells. This has been established for position:relative in CSS2.1 (and caused a crash in containingBlock()
+        // After performing the display mutation, check table rows. We do not honor position:relativetable rows or cells.
+        // This has been established for position:relative in CSS2.1 (and caused a crash in containingBlock()
         // on some sites).
-        if ((style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW_GROUP
+        if (((style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW_GROUP
             || style->display() == TABLE_FOOTER_GROUP || style->display() == TABLE_ROW)
             && style->position() == RelativePosition)
+            // Do not allow position:sticky for table columns and column groups because table columns
+            // don't have RenderLayer
+            || ((style->display() == TABLE_COLUMN_GROUP || style->display() == TABLE_COLUMN)
+            && style->position() == StickyPosition))

[Julien - ping for review, 2014/03/12 18:41:38]

I would rather have that as a separate branch below. That would make the code
more readable.

[ostap, 2014/03/12 20:12:57]

Done.

             style->setPosition(StaticPosition);
 
         // writing-mode does not apply to table row groups, table column groups, table rows, and table columns.