Tie scroll anchoring adjustments to frame lifecycle instead of layout.

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

 /*
  * 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, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 1977 matching lines @@
   return false;
 }
 
 void Document::updateStyleAndLayoutTreeForNode(const Node* node) {
   DCHECK(node);
   if (!needsLayoutTreeUpdateForNode(*node))
     return;
   updateStyleAndLayoutTree();
 }
 
-void Document::updateStyleAndLayoutIgnorePendingStylesheetsForNode(Node* node) {
+void Document::updateStyleAndLayoutIgnorePendingStylesheetsForNode(
+    const Node* node) {
   DCHECK(node);
   if (!node->inActiveDocument())
     return;
   updateStyleAndLayoutIgnorePendingStylesheets();
 }
 
+void Document::updateScrollPosition(const Node* node) {
+  if (node)
+    updateStyleAndLayoutIgnorePendingStylesheetsForNode(node);
+  else
+    updateStyleAndLayoutIgnorePendingStylesheets();
+
+  if (FrameView* frameView = view())
+    frameView->performScrollAnchoringAdjustments();
+}
+
 void Document::updateStyleAndLayout() {
   DCHECK(isMainThread());
 
   ScriptForbiddenScope forbidScript;
 
   FrameView* frameView = view();
   if (frameView && frameView->isInPerformLayout()) {
     // View layout should not be re-entrant.
     NOTREACHED();
     return;
@@ skipping 4386 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif