Remove owning_id from EffectNode and replace it by an opaque stable_id

third_party/WebKit/public/platform/WebScrollbarLayer.h

Index: third_party/WebKit/public/platform/WebScrollbarLayer.h
diff --git a/third_party/WebKit/public/platform/WebScrollbarLayer.h b/third_party/WebKit/public/platform/WebScrollbarLayer.h
index 90975049324692f4bdd234b3d0c7731c63defc29..f014571d24c91dd1c1c37b957cb349346291df9d 100644
--- a/third_party/WebKit/public/platform/WebScrollbarLayer.h
+++ b/third_party/WebKit/public/platform/WebScrollbarLayer.h
@@ -29,6 +29,7 @@
 #include "WebLayer.h"
 #include "WebScrollbarThemeGeometry.h"
 #include "WebScrollbarThemePainter.h"
+#include "cc/trees/element_id.h"
 
 namespace blink {
 
@@ -39,6 +40,8 @@ class WebScrollbarLayer {
   virtual WebLayer* Layer() = 0;
 
   virtual void SetScrollLayer(WebLayer*) = 0;
+
+  virtual void SetElementId(const cc::ElementId&) = 0;
 };
 
 }  // namespace blink