Tie scroll anchoring adjustments to frame lifecycle instead of layout.

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

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index dbf24300948695646d45183b83c1007d842adeab..37f5a678ac82a3676837032340b05d63d74a6a99 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -495,6 +495,9 @@ class CORE_EXPORT Document : public ContainerNode,
   void updateStyleAndLayoutTreeIgnorePendingStylesheets();
   void updateStyleAndLayoutTreeForNode(const Node*);
   void updateStyleAndLayout();
+  // Equivalent to updateStyleAndLayoutIgnorePendingStylesheets, plus scroll
+  // anchoring adjustments.
+  void updateScrollPosition(const Node* = nullptr);
   void layoutUpdated();
   enum RunPostLayoutTasks {
     RunPostLayoutTasksAsyhnchronously,
@@ -502,7 +505,7 @@ class CORE_EXPORT Document : public ContainerNode,
   };
   void updateStyleAndLayoutIgnorePendingStylesheets(
       RunPostLayoutTasks = RunPostLayoutTasksAsyhnchronously);
-  void updateStyleAndLayoutIgnorePendingStylesheetsForNode(Node*);
+  void updateStyleAndLayoutIgnorePendingStylesheetsForNode(const Node*);
   PassRefPtr<ComputedStyle> styleForElementIgnoringPendingStylesheets(Element*);
   PassRefPtr<ComputedStyle> styleForPage(int pageIndex);