[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 cdc6f2a23b7d8894c1a4cf2a9d0ff1f9b24bc404..674d99af094cfecb9f56b8435b9a0ae631f7b9fe 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"
@@ -1010,9 +1011,10 @@ 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 &&

[yosin_UTC9, 2017/06/01 03:29:12]

How about introduce global function IsSpellingMarker(const Marker&)?
Since, this conditional expression is used three times, DEFINE_TYPE_CAST() and
here,
it is over threshold.

+                  marker->GetType() != DocumentMarker::kGrammar))
     return String();
-  return marker->Description();
+  return ToSpellCheckMarker(marker)->Description();
 }
 
 static WTF::Optional<TextMatchMarker::MatchStatus> MatchStatusFrom(