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

services/ui/ws/window_manager_state.h

Index: services/ui/ws/window_manager_state.h
diff --git a/services/ui/ws/window_manager_state.h b/services/ui/ws/window_manager_state.h
index 67a343b533682225d4be403a8927ac0256fdc171..108fd1040578a5a128969d220c92e647ebcd12e5 100644
--- a/services/ui/ws/window_manager_state.h
+++ b/services/ui/ws/window_manager_state.h
@@ -9,6 +9,8 @@
 
 #include <memory>
 #include <queue>
+#include <string>
+#include <unordered_map>
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
@@ -100,7 +102,9 @@ class WindowManagerState : public EventDispatcherDelegate,
   void OnEventAck(mojom::WindowTree* tree, mojom::EventResult result);
 
   // Called when the WindowManager acks an accelerator.
-  void OnAcceleratorAck(mojom::EventResult result);
+  void OnAcceleratorAck(
+      mojom::EventResult result,
+      const std::unordered_map<std::string, std::vector<uint8_t>>& properties);
 
  private:
   class ProcessedEventTarget;