Remove owning_id from EffectNode and replace it by an opaque stable_id

third_party/WebKit/public/platform/WebScrollbarLayer.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebScrollbarLayer_h
 #define WebScrollbarLayer_h
 
 #include "WebLayer.h"
 #include "WebScrollbarThemeGeometry.h"
 #include "WebScrollbarThemePainter.h"
+#include "cc/trees/element_id.h"
 
 namespace blink {
 
 class WebScrollbarLayer {
  public:
   virtual ~WebScrollbarLayer() {}
 
   virtual WebLayer* Layer() = 0;
 
   virtual void SetScrollLayer(WebLayer*) = 0;
+
+  virtual void SetElementId(const cc::ElementId&) = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebScrollbarLayer_h