Tie scroll anchoring adjustments to frame lifecycle instead of layout.

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 1d02cf51a8f803f3045df673fe1cb1b8534986fd..07ef46374045ad50d8da1febc73c18298d05acb8 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -1995,13 +1995,24 @@ void Document::updateStyleAndLayoutTreeForNode(const Node* node) {
   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());