[WIP] Move DocumentMarker accessors into subclasses

third_party/WebKit/Source/core/paint/InlineTextBoxPainter.cpp

Index: third_party/WebKit/Source/core/paint/InlineTextBoxPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/InlineTextBoxPainter.cpp b/third_party/WebKit/Source/core/paint/InlineTextBoxPainter.cpp
index b46e742c2e33dbb443ce2d3856c22bb16242dc8d..c8f792bf228599c22e6666b34221ab0d02e4ceee 100644
--- a/third_party/WebKit/Source/core/paint/InlineTextBoxPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/InlineTextBoxPainter.cpp
@@ -6,7 +6,9 @@
 
 #include "core/editing/CompositionUnderline.h"
 #include "core/editing/Editor.h"
+#include "core/editing/markers/CompositionMarker.h"
 #include "core/editing/markers/DocumentMarkerController.h"
+#include "core/editing/markers/TextMatchMarker.h"
 #include "core/frame/LocalFrame.h"
 #include "core/layout/LayoutTextCombine.h"
 #include "core/layout/LayoutTheme.h"
@@ -856,17 +858,21 @@ void InlineTextBoxPainter::paintDocumentMarkers(
                                             marker, style, font, true);
         break;
       case DocumentMarker::TextMatch:
-        if (markerPaintPhase == DocumentMarkerPaintPhase::Background)
-          m_inlineTextBox.paintTextMatchMarkerBackground(paintInfo, boxOrigin,
-                                                         marker, style, font);
-        else
-          m_inlineTextBox.paintTextMatchMarkerForeground(paintInfo, boxOrigin,
-                                                         marker, style, font);
+        if (markerPaintPhase == DocumentMarkerPaintPhase::Background) {
+          m_inlineTextBox.paintTextMatchMarkerBackground(
+              paintInfo, boxOrigin, toTextMatchMarker(marker), style, font);
+        } else {
+          m_inlineTextBox.paintTextMatchMarkerForeground(
+              paintInfo, boxOrigin, toTextMatchMarker(marker), style, font);
+        }
         break;
       case DocumentMarker::Composition: {
-        CompositionUnderline underline(marker.startOffset(), marker.endOffset(),
-                                       marker.underlineColor(), marker.thick(),
-                                       marker.backgroundColor());
+        const CompositionMarker& compositionMarker =
+            toCompositionMarker(marker);
+        CompositionUnderline underline(
+            compositionMarker.startOffset(), compositionMarker.endOffset(),
+            compositionMarker.underlineColor(), compositionMarker.thick(),
+            compositionMarker.backgroundColor());
         if (markerPaintPhase == DocumentMarkerPaintPhase::Background)
           paintSingleCompositionBackgroundRun(
               paintInfo.context, boxOrigin, style, font,
@@ -1303,7 +1309,7 @@ void InlineTextBoxPainter::paintCompositionUnderline(
 void InlineTextBoxPainter::paintTextMatchMarkerForeground(
     const PaintInfo& paintInfo,
     const LayoutPoint& boxOrigin,
-    const DocumentMarker& marker,
+    const TextMatchMarker& marker,
     const ComputedStyle& style,
     const Font& font) {
   if (!inlineLayoutObject().frame()->editor().markedTextMatchesAreHighlighted())
@@ -1342,7 +1348,7 @@ void InlineTextBoxPainter::paintTextMatchMarkerForeground(
 void InlineTextBoxPainter::paintTextMatchMarkerBackground(
     const PaintInfo& paintInfo,
     const LayoutPoint& boxOrigin,
-    const DocumentMarker& marker,
+    const TextMatchMarker& marker,
     const ComputedStyle& style,
     const Font& font) {
   if (!LineLayoutAPIShim::layoutObjectFrom(m_inlineTextBox.getLineLayoutItem())