Track the region where text is painted.

Source/core/rendering/RenderListMarker.cpp

Index: Source/core/rendering/RenderListMarker.cpp
diff --git a/Source/core/rendering/RenderListMarker.cpp b/Source/core/rendering/RenderListMarker.cpp
index f429f31053ccf8b03e06a0802b90e1e05099b70f..b1c8785c7ef4460bb4872f9e58eb81c92596bc6f 100644
--- a/Source/core/rendering/RenderListMarker.cpp
+++ b/Source/core/rendering/RenderListMarker.cpp
@@ -1277,10 +1277,13 @@ void RenderListMarker::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffse
         context->translate(-marker.x(), -marker.maxY());
     }
 
+    TextRunPaintInfo textRunPaintInfo(textRun);
+    textRunPaintInfo.bounds = marker;
     IntPoint textOrigin = IntPoint(marker.x(), marker.y() + style()->fontMetrics().ascent());
 
-    if (type == Asterisks || type == Footnotes)
-        context->drawText(font, textRun, textOrigin);
+    if (type == Asterisks || type == Footnotes) {
+        context->drawText(font, textRunPaintInfo, textOrigin);
+    }
     else {
         // Text is not arbitrary. We can judge whether it's RTL from the first character,
         // and we only need to handle the direction RightToLeft for now.
@@ -1296,16 +1299,21 @@ void RenderListMarker::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffse
 
         const UChar suffix = listMarkerSuffix(type, m_listItem->value());
         if (style()->isLeftToRightDirection()) {
-            int width = font.width(textRun);
-            context->drawText(font, textRun, textOrigin);
+            context->drawText(font, textRunPaintInfo, textOrigin);
+
             UChar suffixSpace[2] = { suffix, ' ' };
-            context->drawText(font, RenderBlock::constructTextRun(this, font, suffixSpace, 2, style()), textOrigin + IntSize(width, 0));
+            TextRun suffixRun = RenderBlock::constructTextRun(this, font, suffixSpace, 2, style());
+            TextRunPaintInfo suffixRunInfo(suffixRun);
+            suffixRunInfo.bounds = marker;
+            context->drawText(font, suffixRunInfo, textOrigin + IntSize(font.width(textRun), 0));
         } else {
             UChar spaceSuffix[2] = { ' ', suffix };
-            TextRun spaceSuffixRun = RenderBlock::constructTextRun(this, font, spaceSuffix, 2, style());
-            int width = font.width(spaceSuffixRun);
-            context->drawText(font, spaceSuffixRun, textOrigin);
-            context->drawText(font, textRun, textOrigin + IntSize(width, 0));
+            TextRun suffixRun = RenderBlock::constructTextRun(this, font, spaceSuffix, 2, style());
+            TextRunPaintInfo suffixRunInfo(suffixRun);
+            suffixRunInfo.bounds = marker;
+            context->drawText(font, suffixRunInfo, textOrigin);
+
+            context->drawText(font, textRunPaintInfo, textOrigin + IntSize(font.width(suffixRun), 0));
         }
     }
 }