Fixed perf regression by removing tree traversal for text sibling.

third_party/WebKit/Source/core/dom/StyleReattachData.h

Index: third_party/WebKit/Source/core/dom/StyleReattachData.h
diff --git a/third_party/WebKit/Source/core/dom/StyleReattachData.h b/third_party/WebKit/Source/core/dom/StyleReattachData.h
new file mode 100644
index 0000000000000000000000000000000000000000..9b5daad0b2856054081ea91950df396873f4cfc8
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/StyleReattachData.h
@@ -0,0 +1,20 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef StyleReattachData_h
+#define StyleReattachData_h
+
+namespace blink {
+
+struct StyleReattachData {
+  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
+  DEFINE_INLINE_TRACE() { visitor->trace(nextTextSibling); }
+
+  RefPtr<ComputedStyle> computedStyle;
+  Member<Text> nextTextSibling;
+};
+
+}  // namespace blink
+
+#endif  // StyleReattachData_h