[DMC #5.6] Add type cast for SpellCheckMarkerListImpl

third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h

Index: third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h
diff --git a/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h b/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h
index def3f14199fc6dd88a144fb3e4d3245fbfc2ac4e..1b508ece06b9b3dc02f37b4b2e07a948d429601b 100644
--- a/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h
+++ b/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerListImpl.h
@@ -43,6 +43,14 @@ class CORE_EXPORT SpellCheckMarkerListImpl : public DocumentMarkerList {
   DISALLOW_COPY_AND_ASSIGN(SpellCheckMarkerListImpl);
 };
 
+DEFINE_TYPE_CASTS(SpellCheckMarkerListImpl,
+                  DocumentMarkerList,
+                  list,
+                  list->MarkerType() == DocumentMarker::kSpelling ||
+                      list->MarkerType() == DocumentMarker::kGrammar,
+                  list.MarkerType() == DocumentMarker::kSpelling ||
+                      list.MarkerType() == DocumentMarker::kGrammar);
+
 }  // namespace blink
 
 #endif  // SpellCheckMarkerListImpl_h