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content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 67b3b1f22844cb16cf2282da6a2dd40c59bca25f..5e9d447bb41cbaab7ec3c21d26215ed404b517e5 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -988,8 +988,6 @@ void RenderWidgetHostImpl::ForwardWheelEventWithLatencyInfo(
   if (IgnoreInputEvents())
     return;
 
-  if (delegate_->PreHandleWheelEvent(wheel_event.event))
-    return;
 
   input_router_->SendWheelEvent(wheel_event);
 }
@@ -2043,6 +2041,10 @@ void RenderWidgetHostImpl::OnWheelEventAck(
   }
 
   const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
+  if (!processed) {
+    if (delegate_->PreHandleWheelEvent(wheel_event.event))
+      return;
+  }
   if (!processed && !is_hidden() && view_)
     view_->UnhandledWheelEvent(wheel_event.event);
 }