List marker pseudo elements.

Source/core/rendering/TextAutosizer.cpp

Index: Source/core/rendering/TextAutosizer.cpp
diff --git a/Source/core/rendering/TextAutosizer.cpp b/Source/core/rendering/TextAutosizer.cpp
index f3ebe7f45eb89003dc8e37a9551fbe1aa148e64a..19ef56cff7cc17f8778a4e9bcf84f8fb6c4d72dd 100644
--- a/Source/core/rendering/TextAutosizer.cpp
+++ b/Source/core/rendering/TextAutosizer.cpp
@@ -32,6 +32,7 @@
 #include "core/rendering/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(RenderObject* parent, InflateBehavior behavior, flo
             // FIXME: Investigate why MarkOnlyThis is sufficient.
             if (parent->isRenderInline())
                 child->setPreferredLogicalWidthsDirty(MarkOnlyThis);
+
         } else if (child->isRenderInline()) {
             multiplier = inflate(child, behavior, multiplier);
+
         } else if (child->isRenderBlock() && behavior == DescendToInnerBlocks
             && !classifyBlock(child, INDEPENDENT | EXPLICIT_WIDTH | SUPPRESSING)) {
             multiplier = inflate(child, behavior, multiplier);
@@ -470,11 +473,20 @@ float TextAutosizer::inflate(RenderObject* 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()) {
+        if (PseudoElement* element = toElement(parent->node())->pseudoElement(MARKER)) {
+            inflateListItem(toRenderListItem(parent), toRenderListMarker(element->renderer()));
+            element->renderer()->setPreferredLogicalWidthsDirty(MarkOnlyThis);
+        }
+    }
+
     return multiplier;
 }