Move serializer related files in core/editing/ related files into core/editing/serializers/

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index d0c56c968994ffc5e3e2bdb3c3798f888f6c4d0e..7aa8675652b76701e996401d66b5c53984d7be2f 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -1309,7 +1309,6 @@
             'editing/FormatBlockCommand.h',
             'editing/FrameSelection.cpp',
             'editing/GranularityStrategy.cpp',
-            'editing/HTMLInterchange.cpp',
             'editing/IndentOutdentCommand.cpp',
             'editing/IndentOutdentCommand.h',
             'editing/InputMethodController.cpp',
@@ -1343,10 +1342,6 @@
             'editing/markers/DocumentMarkerController.cpp',
             'editing/markers/DocumentMarkerController.h',
             'editing/markers/RenderedDocumentMarker.h',
-            'editing/MarkupAccumulator.cpp',
-            'editing/MarkupAccumulator.h',
-            'editing/MarkupFormatter.cpp',
-            'editing/MarkupFormatter.h',
             'editing/MergeIdenticalElementsCommand.cpp',
             'editing/MergeIdenticalElementsCommand.h',
             'editing/MoveSelectionCommand.cpp',
@@ -1374,8 +1369,6 @@
             'editing/SelectionController.cpp',
             'editing/SelectionController.h',
             'editing/SelectionType.h',
-            'editing/Serialization.cpp',
-            'editing/Serialization.h',
             'editing/SetNodeAttributeCommand.cpp',
             'editing/SetNodeAttributeCommand.h',
             'editing/SimplifyMarkupCommand.cpp',
@@ -1387,16 +1380,10 @@
             'editing/SplitTextNodeCommand.h',
             'editing/SplitTextNodeContainingElementCommand.cpp',
             'editing/SplitTextNodeContainingElementCommand.h',
-            'editing/StyledMarkupAccumulator.cpp',
-            'editing/StyledMarkupAccumulator.h',
-            'editing/StyledMarkupSerializer.cpp',
-            'editing/StyledMarkupSerializer.h',
             'editing/SurroundingText.cpp',
             'editing/SurroundingText.h',
             'editing/TextInsertionBaseCommand.cpp',
             'editing/TextInsertionBaseCommand.h',
-            'editing/TextOffset.cpp',
-            'editing/TextOffset.h',
             'editing/TypingCommand.cpp',
             'editing/UndoStack.cpp',
             'editing/UndoStack.h',
@@ -1408,6 +1395,20 @@
             'editing/VisibleUnits.cpp',
             'editing/WrapContentsInDummySpanCommand.cpp',
             'editing/WrapContentsInDummySpanCommand.h',
+            'editing/serializers/HTMLInterchange.cpp',
+            'editing/serializers/HTMLInterchange.h',
+            'editing/serializers/MarkupAccumulator.cpp',
+            'editing/serializers/MarkupAccumulator.h',
+            'editing/serializers/MarkupFormatter.cpp',
+            'editing/serializers/MarkupFormatter.h',
+            'editing/serializers/Serialization.cpp',
+            'editing/serializers/Serialization.h',
+            'editing/serializers/StyledMarkupAccumulator.cpp',
+            'editing/serializers/StyledMarkupAccumulator.h',
+            'editing/serializers/StyledMarkupSerializer.cpp',
+            'editing/serializers/StyledMarkupSerializer.h',
+            'editing/serializers/TextOffset.cpp',
+            'editing/serializers/TextOffset.h',
             'editing/spellcheck/SpellCheckRequester.cpp',
             'editing/spellcheck/SpellCheckRequester.h',
             'editing/spellcheck/SpellChecker.cpp',
@@ -3753,11 +3754,11 @@
             'editing/iterators/TextIteratorTest.cpp',
             'editing/markers/DocumentMarkerControllerTest.cpp',
             'editing/PositionTest.cpp',
-            'editing/StyledMarkupSerializerTest.cpp',
             'editing/SurroundingTextTest.cpp',
             'editing/VisiblePositionTest.cpp',
             'editing/VisibleSelectionTest.cpp',
             'editing/VisibleUnitsTest.cpp',
+            'editing/serializers/StyledMarkupSerializerTest.cpp',
             'events/EventPathTest.cpp',
             'fetch/CachingCorrectnessTest.cpp',
             'fetch/ClientHintsPreferencesTest.cpp',