Invalidate first line display item clients when first line style changes

third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp b/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
index 3d7b00a155cc56f05ddcf3cbe3f00a7405d4368f..cf9b7d198c9f80d07e7d08849d42b5430564a63e 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
@@ -2065,4 +2065,30 @@ LayoutUnit LayoutBlockFlow::startAlignedOffsetForLine(LayoutUnit position, bool
     return logicalLeft;
 }
 
+static void invalidteDisplayItemClientsOfInlineBoxRecursively(InlineBox& box)
+{
+    box.layoutObject().invalidateDisplayItemClient(box);
+    if (!box.isInlineFlowBox())
+        return;
+    for (InlineBox* child = toInlineFlowBox(box).firstChild(); child; child = child->nextOnLine())
+        invalidteDisplayItemClientsOfInlineBoxRecursively(*child);
+}
+
+void LayoutBlockFlow::invalidateDisplayItemClientsOfFirstLine()
+{
+    if (childrenInline()) {
+        // This block has the first line.
+        if (RootInlineBox* firstRootBox = this->firstRootBox())
+            invalidteDisplayItemClientsOfInlineBoxRecursively(*firstRootBox);
+        return;
+    }
+
+    // Let the first child flow find the first line.
+    LayoutObject* child = firstChild();
+    while (child && child->isFloatingOrOutOfFlowPositioned())
+        child = child->nextSibling();
+    if (child && child->isLayoutBlockFlow())
+        toLayoutBlockFlow(child)->invalidateDisplayItemClientsOfFirstLine();
+}
+
 }