Add CompositionMarkerList in preparation for DocumentMarkerController refactor

third_party/WebKit/Source/core/editing/BUILD.gn

Index: third_party/WebKit/Source/core/editing/BUILD.gn
diff --git a/third_party/WebKit/Source/core/editing/BUILD.gn b/third_party/WebKit/Source/core/editing/BUILD.gn
index b1ac27985a435e4ab60523c3765ec3aca8b57237..3e67ffe07b578624390a2bffc8b28dd2cc720a99 100644
--- a/third_party/WebKit/Source/core/editing/BUILD.gn
+++ b/third_party/WebKit/Source/core/editing/BUILD.gn
@@ -180,10 +180,16 @@ blink_core_sources("editing") {
     "iterators/TextSearcherICU.h",
     "iterators/WordAwareIterator.cpp",
     "iterators/WordAwareIterator.h",
+    "markers/CompositionMarkerList.cpp",
+    "markers/CompositionMarkerList.h",
     "markers/DocumentMarker.cpp",
     "markers/DocumentMarker.h",
     "markers/DocumentMarkerController.cpp",
     "markers/DocumentMarkerController.h",
+    "markers/DocumentMarkerList.cpp",
+    "markers/DocumentMarkerList.h",
+    "markers/EditingMarkerList.cpp",
+    "markers/EditingMarkerList.h",
     "markers/RenderedDocumentMarker.h",
     "serializers/HTMLInterchange.cpp",
     "serializers/HTMLInterchange.h",
@@ -277,6 +283,7 @@ source_set("unit_tests") {
     "iterators/TextSearcherICUTest.cpp",
     "markers/DocumentMarkerControllerTest.cpp",
     "markers/DocumentMarkerTest.cpp",
+    "markers/EditingMarkerListTest.cpp",
     "serializers/StyledMarkupSerializerTest.cpp",
     "spellcheck/IdleSpellCheckCallbackTest.cpp",
     "spellcheck/SpellCheckTestBase.cpp",