Tie scroll anchoring adjustments to frame lifecycle instead of layout.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 477 matching lines @@
 
   bool needsLayoutTreeUpdate() const;
   bool needsLayoutTreeUpdateForNode(const Node&) const;
   // Update ComputedStyles and attach LayoutObjects if necessary, but don't
   // lay out.
   void updateStyleAndLayoutTree();
   // Same as updateStyleAndLayoutTree() except ignoring pending stylesheets.
   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,
     RunPostLayoutTasksSynchronously,
   };
   void updateStyleAndLayoutIgnorePendingStylesheets(
       RunPostLayoutTasks = RunPostLayoutTasksAsyhnchronously);
-  void updateStyleAndLayoutIgnorePendingStylesheetsForNode(Node*);
+  void updateStyleAndLayoutIgnorePendingStylesheetsForNode(const Node*);
   PassRefPtr<ComputedStyle> styleForElementIgnoringPendingStylesheets(Element*);
   PassRefPtr<ComputedStyle> styleForPage(int pageIndex);
 
   // Returns true if page box (margin boxes and page borders) is visible.
   bool isPageBoxVisible(int pageIndex);
 
   // Returns the preferred page size and margins in pixels, assuming 96
   // pixels per inch. pageSize, marginTop, marginRight, marginBottom,
   // marginLeft must be initialized to the default values that are used if
   // auto is specified.
@@ skipping 1170 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif  // Document_h