Adds ability for pre-target accelerators to not consume events

services/ui/public/cpp/lib/window_tree_client.cc

Index: services/ui/public/cpp/lib/window_tree_client.cc
diff --git a/services/ui/public/cpp/lib/window_tree_client.cc b/services/ui/public/cpp/lib/window_tree_client.cc
index 570d3e10d63b5c0b8b3995c1b1dfd3e4a4e80204..8c135735b9a476c9071432d2c788cd3aee8cd0f1 100644
--- a/services/ui/public/cpp/lib/window_tree_client.cc
+++ b/services/ui/public/cpp/lib/window_tree_client.cc
@@ -1187,10 +1187,14 @@ void WindowTreeClient::WmCancelMoveLoop(uint32_t change_id) {
     window_manager_delegate_->OnWmCancelMoveLoop(window);
 }
 
-void WindowTreeClient::OnAccelerator(uint32_t id,
+void WindowTreeClient::OnAccelerator(uint32_t ack_id,
+                                     uint32_t accelerator_id,
                                      std::unique_ptr<ui::Event> event) {
   DCHECK(event);
-  window_manager_delegate_->OnAccelerator(id, *event.get());
+  const mojom::EventResult result =
+      window_manager_delegate_->OnAccelerator(accelerator_id, *event.get());
+  if (ack_id && window_manager_internal_client_)
+    window_manager_internal_client_->OnAcceleratorAck(ack_id, result);
 }
 
 void WindowTreeClient::SetFrameDecorationValues(