Adds ability for accelerators to add key/value pairs to KeyEvent

ui/aura/mus/window_tree_client.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/mus/window_tree_client.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 1573 matching lines @@
   parent->StackChildAtTop(window->GetWindow());
 
   if (window_manager_internal_client_)
     window_manager_internal_client_->WmResponse(wm_change_id, true);
 }
 
 void WindowTreeClient::OnAccelerator(uint32_t ack_id,
                                      uint32_t accelerator_id,
                                      std::unique_ptr<ui::Event> event) {
   DCHECK(event);
-  const ui::mojom::EventResult result =
-      window_manager_delegate_->OnAccelerator(accelerator_id, *event.get());
+  std::unordered_map<std::string, std::vector<uint8_t>> properties;
+  const ui::mojom::EventResult result = window_manager_delegate_->OnAccelerator(
+      accelerator_id, *event.get(), &properties);
   if (ack_id && window_manager_internal_client_)
-    window_manager_internal_client_->OnAcceleratorAck(ack_id, result);
+    window_manager_internal_client_->OnAcceleratorAck(ack_id, result,
+                                                      properties);
 }
 
 void WindowTreeClient::SetFrameDecorationValues(
     ui::mojom::FrameDecorationValuesPtr values) {
   if (window_manager_internal_client_) {
     window_manager_internal_client_->WmSetFrameDecorationValues(
         std::move(values));
   }
 }
 
@@ skipping 258 matching lines @@
   return ScheduleInFlightChange(base::MakeUnique<InFlightCaptureChange>(
       this, capture_synchronizer_.get(), window));
 }
 
 uint32_t WindowTreeClient::CreateChangeIdForFocus(WindowMus* window) {
   return ScheduleInFlightChange(base::MakeUnique<InFlightFocusChange>(
       this, focus_synchronizer_.get(), window));
 }
 
 }  // namespace aura