Add support for new scroll valuators coming from CMT

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index fe86f4814f59e034d9e4cd5300c55dc1b185d744..f56e0851cbe5a39ee845e1567681dbe989226257 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -506,6 +506,10 @@ int RenderWidgetHostViewAura::GetNonClientComponent(
 bool RenderWidgetHostViewAura::OnMouseEvent(aura::MouseEvent* event) {
   if (event->type() == ui::ET_MOUSEWHEEL)
     host_->ForwardWheelEvent(content::MakeWebMouseWheelEvent(event));
+  else if (event->type() == ui::ET_SCROLL)
+    host_->ForwardWheelEvent(
+        content::MakeWebMouseWheelEvent(
+            static_cast<aura::ScrollEvent*>(event)));
   else if (CanRendererHandleEvent(event->native_event()))
     host_->ForwardMouseEvent(content::MakeWebMouseEvent(event));