Plumb firing passive event listeners.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 616392355a5ab48c8914a4ed0a96a747f85c7035..9d8d33126b547bda498ef4de586a39dd46a036ea 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2139,6 +2139,10 @@ void RenderViewImpl::initializeLayerTreeView() {
   if (!rwc)
     return;
 
+  bool enable_wheel_gestures =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableWheelGestures);
+
   bool use_threaded_event_handling = true;
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   // Disable threaded event handling if content is not handling the elastic
@@ -2156,7 +2160,7 @@ void RenderViewImpl::initializeLayerTreeView() {
     if (input_handler_manager) {
       input_handler_manager->AddInputHandler(
           routing_id(), rwc->GetInputHandler(), AsWeakPtr(),
-          webkit_preferences_.enable_scroll_animator);
+          webkit_preferences_.enable_scroll_animator, enable_wheel_gestures);
     }
   }
 }