Move scroll event handlers from layer to layer tree view.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 5bf9c46ab54ac3eb788a86bdd462562cdbab4f08..fc6489dbe5a3f03564a030879342b0af8a8bb467 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -753,6 +753,14 @@ bool RenderWidgetCompositor::haveWheelEventHandlers() const {
   return layer_tree_host_->have_wheel_event_handlers();
 }
 
+void RenderWidgetCompositor::setHaveScrollEventHandlers(bool has_handlers) {
+  layer_tree_host_->SetHaveScrollEventHandlers(has_handlers);
+}
+
+bool RenderWidgetCompositor::haveScrollEventHandlers() const {
+  return layer_tree_host_->have_scroll_event_handlers();
+}
+
 void CompositeAndReadbackAsyncCallback(
     blink::WebCompositeAndReadbackAsyncCallback* callback,
     scoped_ptr<cc::CopyOutputResult> result) {