[DMC #24] Add SpellingMarker and GrammarMarker (subclasses of DocumentMarker)

third_party/WebKit/Source/core/testing/Internals.cpp

Index: third_party/WebKit/Source/core/testing/Internals.cpp
diff --git a/third_party/WebKit/Source/core/testing/Internals.cpp b/third_party/WebKit/Source/core/testing/Internals.cpp
index 0e9f300e2e332710f2db273a5f143d58ac87bf60..6512225803bfc9d5c2817b8acd221033ec046fb7 100644
--- a/third_party/WebKit/Source/core/testing/Internals.cpp
+++ b/third_party/WebKit/Source/core/testing/Internals.cpp
@@ -65,6 +65,7 @@
 #include "core/editing/iterators/TextIterator.h"
 #include "core/editing/markers/DocumentMarker.h"
 #include "core/editing/markers/DocumentMarkerController.h"
+#include "core/editing/markers/SpellCheckMarker.h"
 #include "core/editing/markers/TextMatchMarker.h"
 #include "core/editing/serializers/Serialization.h"
 #include "core/editing/spellcheck/IdleSpellCheckCallback.h"
@@ -1014,9 +1015,10 @@ String Internals::markerDescriptionForNode(Node* node,
                                            unsigned index,
                                            ExceptionState& exception_state) {
   DocumentMarker* marker = MarkerAt(node, marker_type, index, exception_state);
-  if (!marker)
+  if (!marker || (marker->GetType() != DocumentMarker::kSpelling &&
+                  marker->GetType() != DocumentMarker::kGrammar))
     return String();
-  return marker->Description();
+  return ToSpellCheckMarker(marker)->Description();
 }
 
 static WTF::Optional<TextMatchMarker::MatchStatus> MatchStatusFrom(