[DMC #23] Add CompositionMarker (subclass of DocumentMarker)

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/InlineTextBoxPainter.h"
 
 #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"
 #include "core/layout/api/LineLayoutAPIShim.h"
 #include "core/layout/api/LineLayoutBox.h"
 #include "core/layout/line/InlineTextBox.h"
 #include "core/paint/AppliedDecorationPainter.h"
 #include "core/paint/DecorationInfo.h"
@@ skipping 650 matching lines @@
       case DocumentMarker::kTextMatch:
         if (marker_paint_phase == DocumentMarkerPaintPhase::kBackground) {
           inline_text_box_.PaintTextMatchMarkerBackground(
               paint_info, box_origin, ToTextMatchMarker(marker), style, font);
         } else {
           inline_text_box_.PaintTextMatchMarkerForeground(
               paint_info, box_origin, ToTextMatchMarker(marker), style, font);
         }
         break;
       case DocumentMarker::kComposition: {
-        CompositionUnderline underline(marker.StartOffset(), marker.EndOffset(),
-                                       marker.UnderlineColor(), marker.Thick(),
-                                       marker.BackgroundColor());
+        const CompositionMarker& composition_marker =
+            ToCompositionMarker(marker);
+        CompositionUnderline underline(
+            composition_marker.StartOffset(), composition_marker.EndOffset(),
+            composition_marker.UnderlineColor(), composition_marker.Thick(),
+            composition_marker.BackgroundColor());
         if (marker_paint_phase == DocumentMarkerPaintPhase::kBackground)
           PaintSingleCompositionBackgroundRun(
               paint_info.context, box_origin, style, font,
               underline.BackgroundColor(), UnderlinePaintStart(underline),
               UnderlinePaintEnd(underline));
         else
           PaintCompositionUnderline(paint_info.context, box_origin, underline);
       } break;
       default:
         NOTREACHED();
@@ skipping 480 matching lines @@
 
   LayoutRect box_rect(box_origin, LayoutSize(inline_text_box_.LogicalWidth(),
                                              inline_text_box_.LogicalHeight()));
   context.Clip(FloatRect(box_rect));
   context.DrawHighlightForText(font, run, FloatPoint(box_origin),
                                box_rect.Height().ToInt(), color,
                                paint_offsets.first, paint_offsets.second);
 }
 
 }  // namespace blink