Add full offset mapping construction in a block

third_party/WebKit/Source/core/layout/LayoutTextFragment.h

Index: third_party/WebKit/Source/core/layout/LayoutTextFragment.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutTextFragment.h b/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
index 7d37ef99e187dae92a748b28ac16103466a4d8fb..e62ac8f2533d595b63f3546ac6ead4245db55e50 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
+++ b/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
@@ -92,6 +92,8 @@ class LayoutTextFragment final : public LayoutText {
     return is_remaining_text_layout_object_;
   }
 
+  Text* AssociatedTextNode() const;
+
  protected:
   void WillBeDestroyed() override;
 
@@ -99,7 +101,6 @@ class LayoutTextFragment final : public LayoutText {
   LayoutBlock* BlockForAccompanyingFirstLetter() const;
   UChar PreviousCharacter() const override;
 
-  Text* AssociatedTextNode() const;
   void UpdateHitTestResult(HitTestResult&, const LayoutPoint&) override;
 
   unsigned start_;