Use element id's for animations

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@gmail.com>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 27 matching lines @@
  * deletingthe provisions above and replace them with the notice and
  * other provisions required by the MPL or the GPL, as the case may be.
  * If you do not delete the provisions above, a recipient may use your
  * version of this file under any of the LGPL, the MPL or the GPL.
  */
 
 #include "core/paint/PaintLayerScrollableArea.h"
 
 #include "core/css/PseudoStyleRequest.h"
 #include "core/dom/AXObjectCache.h"
+#include "core/dom/DOMNodeIds.h"
 #include "core/dom/Node.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/input/EventHandler.h"
 #include "core/layout/LayoutFlexibleBox.h"
@@ skipping 1575 matching lines @@
         m_scrollableArea->m_rebuildVerticalScrollbarLayer = true;
 
     if (!scrollbar->isCustomScrollbar())
         m_scrollableArea->willRemoveScrollbar(*scrollbar, orientation);
 
     toFrameView(scrollbar->parent())->removeChild(scrollbar.get());
     scrollbar->disconnectFromScrollableArea();
     scrollbar = nullptr;
 }
 
+uint64_t PaintLayerScrollableArea::id() const
+{
+    return DOMNodeIds::idForNode(box().node());
+}
+
 DEFINE_TRACE(PaintLayerScrollableArea::ScrollbarManager)
 {
     visitor->trace(m_scrollableArea);
     visitor->trace(m_hBar);
     visitor->trace(m_vBar);
 }
 
 int PaintLayerScrollableArea::PreventRelayoutScope::s_count = 0;
 SubtreeLayoutScope* PaintLayerScrollableArea::PreventRelayoutScope::s_layoutScope = nullptr;
 bool PaintLayerScrollableArea::PreventRelayoutScope::s_relayoutNeeded = false;
@@ skipping 84 matching lines @@
 
 void PaintLayerScrollableArea::DelayScrollPositionClampScope::clampScrollableAreas()
 {
     for (auto& scrollableArea : *s_needsClamp)
         scrollableArea->clampScrollPositionsAfterLayout();
     delete s_needsClamp;
     s_needsClamp = nullptr;
 }
 
 } // namespace blink