Avoid style clobbering in setCompositionFromExistingText. (2nd land)

Source/core/editing/markers/DocumentMarkerController.cpp

Index: Source/core/editing/markers/DocumentMarkerController.cpp
diff --git a/Source/core/editing/markers/DocumentMarkerController.cpp b/Source/core/editing/markers/DocumentMarkerController.cpp
index 586289842a50a59afdd84a83d12a4009c7118108..b0040ff6f32e4fc55837210d00959c7c55ff9358 100644
--- a/Source/core/editing/markers/DocumentMarkerController.cpp
+++ b/Source/core/editing/markers/DocumentMarkerController.cpp
@@ -69,6 +69,8 @@ DocumentMarker::MarkerTypeIndex MarkerTypeToMarkerIndex(DocumentMarker::MarkerTy
         return DocumentMarker::TextMatchMarkerIndex;
     case DocumentMarker::InvisibleSpellcheck:
         return DocumentMarker::InvisibleSpellcheckMarkerIndex;
+    case DocumentMarker::Composition:
+        return DocumentMarker::CompositionMarkerIndex;
     }
 
     ASSERT_NOT_REACHED();
@@ -111,6 +113,12 @@ void DocumentMarkerController::addTextMatchMarker(const Range* range, bool activ
     // Don't invalidate tickmarks here. TextFinder invalidates tickmarks using a throttling algorithm. crbug.com/6819.
 }
 
+void DocumentMarkerController::addCompositionMarker(const Position& start, const Position& end, Color underlineColor, bool thick, Color backgroundColor)
+{
+    for (TextIterator markedText(start, end); !markedText.atEnd(); markedText.advance())
+        addMarker(markedText.currentContainer(), DocumentMarker(markedText.startOffsetInCurrentContainer(), markedText.endOffsetInCurrentContainer(), underlineColor, thick, backgroundColor));
+}
+
 void DocumentMarkerController::prepareForDestruction()
 {
     clear();