Implement 'sequential focus navigation starting point.'

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 1488 matching lines @@
 
     if (behavior == UrlFragmentScroll)
         setFragmentAnchor(anchorNode ? static_cast<Node*>(anchorNode) : m_frame->document());
 
     // If the anchor accepts keyboard focus and fragment scrolling is allowed,
     // move focus there to aid users relying on keyboard navigation.
     // If anchorNode is not focusable or fragment scrolling is not allowed,
     // clear focus, which matches the behavior of other browsers.
     if (anchorNode) {
         m_frame->document()->updateLayoutIgnorePendingStylesheets();
-        if (behavior == UrlFragmentScroll && anchorNode->isFocusable())
+        if (behavior == UrlFragmentScroll && anchorNode->isFocusable()) {
             anchorNode->focus();
-        else
+        } else {
+            if (behavior == UrlFragmentScroll)
+                m_frame->document()->setSequentialFocusNavigationStartingPoint(anchorNode);
             m_frame->document()->clearFocusedElement();
+        }
     }
     return true;
 }
 
 void FrameView::setFragmentAnchor(Node* anchorNode)
 {
     ASSERT(anchorNode);
     m_fragmentAnchor = anchorNode;
 
     // We need to update the layout tree before scrolling.
@@ skipping 2587 matching lines @@
     return m_hiddenForThrottling && m_crossOriginForThrottling;
 }
 
 LayoutBox& FrameView::boxForScrollControlPaintInvalidation() const
 {
     ASSERT(layoutView());
     return *layoutView();
 }
 
 } // namespace blink