Assert that continuations be either LayoutBlockFlow or LayoutInline.

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

Index: third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
index ba4acad492869c8797857c75bf02ce3f29c3ef6a..cacade76ccdec0aa563cb49b7fbbf187cd4f69bc 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
@@ -920,6 +920,7 @@ LayoutBoxModelObject* LayoutBoxModelObject::continuation() const
 void LayoutBoxModelObject::setContinuation(LayoutBoxModelObject* continuation)
 {
     if (continuation) {
+        ASSERT(continuation->isLayoutInline() || continuation->isLayoutBlockFlow());
         if (!continuationMap)
             continuationMap = new ContinuationMap;
         continuationMap->set(this, continuation);