List marker pseudo elements.

Source/core/layout/TextAutosizer.cpp

Index: Source/core/layout/TextAutosizer.cpp
diff --git a/Source/core/layout/TextAutosizer.cpp b/Source/core/layout/TextAutosizer.cpp
index 568da42a402b5e6fa9d1d1c72f169184c082d132..83f60c3b38409f748ac4dcc2eb9081241e180403 100644
--- a/Source/core/layout/TextAutosizer.cpp
+++ b/Source/core/layout/TextAutosizer.cpp
@@ -32,6 +32,7 @@
 #include "core/layout/TextAutosizer.h"
 
 #include "core/dom/Document.h"
+#include "core/dom/PseudoElement.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
@@ -459,8 +460,10 @@ float TextAutosizer::inflate(LayoutObject* parent, InflateBehavior behavior, flo
             // FIXME: Investigate why MarkOnlyThis is sufficient.
             if (parent->isLayoutInline())
                 child->setPreferredLogicalWidthsDirty(MarkOnlyThis);
+
         } else if (child->isLayoutInline()) {
             multiplier = inflate(child, behavior, multiplier);
+
         } else if (child->isLayoutBlock() && behavior == DescendToInnerBlocks
             && !classifyBlock(child, INDEPENDENT | EXPLICIT_WIDTH | SUPPRESSING)) {
             multiplier = inflate(child, behavior, multiplier);
@@ -470,11 +473,21 @@ float TextAutosizer::inflate(LayoutObject* parent, InflateBehavior behavior, flo
 
     if (hasTextChild) {
         applyMultiplier(parent, multiplier); // Parent handles line spacing.
+
     } else if (!parent->isListItem()) {
         // For consistency, a block with no immediate text child should always have a
         // multiplier of 1 (except for list items which are handled in inflateListItem).
         applyMultiplier(parent, 1);
     }
+
+    if (RuntimeEnabledFeatures::listMarkerPseudoElementEnabled() && parent->isListItem()) {
+        LayoutListItem* item = toLayoutListItem(parent);
+        if (item->marker()) {
+            inflateListItem(item, item->marker());
+            item->marker()->setPreferredLogicalWidthsDirty(MarkOnlyThis);
+        }
+    }
+
     return multiplier;
 }