Don't allow column spanners inside transforms.

third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp

Index: third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp b/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp
index ea48c2380e124d0da0c44b8e16061b2ed5f886ba..f48795d9ccfb7304f4577bac707002cf80a41cc9 100644
--- a/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp
@@ -87,6 +87,7 @@ static inline bool canContainSpannerInParentFragmentationContext(const LayoutObj
         return false;
     const LayoutBlockFlow& blockFlow = toLayoutBlockFlow(object);
     return !blockFlow.createsNewFormattingContext()
+        && !blockFlow.hasTransformRelatedProperty()

[eae, 2016/04/22 16:52:23]

Could you please add a comment to this method that explains the logic? Something
like the CL description would be great.

[mstensho (USE GERRIT), 2016/04/22 17:44:39]

Done.

         && blockFlow.getPaginationBreakability() != LayoutBox::ForbidBreaks
         && !isMultiColumnContainer(blockFlow);
 }