Pass nextTextSibling to ::before layout rebuild.

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.cpp

Index: third_party/WebKit/Source/core/dom/shadow/ShadowRoot.cpp
diff --git a/third_party/WebKit/Source/core/dom/shadow/ShadowRoot.cpp b/third_party/WebKit/Source/core/dom/shadow/ShadowRoot.cpp
index 17ff2f27d5cceb8e53f0b5d5ec21284fa05fd99b..40fcf03a04d549847b31f36d7190d31d86ee9046 100644
--- a/third_party/WebKit/Source/core/dom/shadow/ShadowRoot.cpp
+++ b/third_party/WebKit/Source/core/dom/shadow/ShadowRoot.cpp
@@ -155,14 +155,14 @@ void ShadowRoot::recalcStyle(StyleRecalcChange change) {
   clearChildNeedsStyleRecalc();
 }
 
-void ShadowRoot::rebuildLayoutTree() {
+void ShadowRoot::rebuildLayoutTree(Text*& nextTextSibling) {
   // ShadowRoot doesn't support custom callbacks.
   DCHECK(!hasCustomStyleCallbacks());
 
   StyleSharingDepthScope sharingScope(*this);
 
   clearNeedsReattachLayoutTree();
-  rebuildChildrenLayoutTrees();
+  rebuildChildrenLayoutTrees(nextTextSibling);
   clearChildNeedsReattachLayoutTree();
 }