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

ui/aura/test/aura_test_base.cc

Index: ui/aura/test/aura_test_base.cc
diff --git a/ui/aura/test/aura_test_base.cc b/ui/aura/test/aura_test_base.cc
index 6d7c340bac14bd51688b4127024bf9e4905c6571..a466611938e48acfd1416ba8cf491569137087bb 100644
--- a/ui/aura/test/aura_test_base.cc
+++ b/ui/aura/test/aura_test_base.cc
@@ -206,8 +206,10 @@ void AuraTestBase::OnWmDisplayRemoved(WindowTreeHostMus* window_tree_host) {
 
 void AuraTestBase::OnWmDisplayModified(const display::Display& display) {}
 
-ui::mojom::EventResult AuraTestBase::OnAccelerator(uint32_t id,
-                                                   const ui::Event& event) {
+ui::mojom::EventResult AuraTestBase::OnAccelerator(
+    uint32_t id,
+    const ui::Event& event,
+    std::unordered_map<std::string, std::vector<uint8_t>>* properties) {
   return ui::mojom::EventResult::HANDLED;
 }