[UI Views] Handle accelerators being pressed for buttons inside a menu

ui/views/controls/button/menu_button.cc

Index: ui/views/controls/button/menu_button.cc
diff --git a/ui/views/controls/button/menu_button.cc b/ui/views/controls/button/menu_button.cc
index 32cfd9c2a23818452c0c9cb98327352e39696b42..c7a53389a142840e66c7e50d712db0d25fb0ee2d 100644
--- a/ui/views/controls/button/menu_button.cc
+++ b/ui/views/controls/button/menu_button.cc
@@ -271,6 +271,13 @@ bool MenuButton::OnKeyReleased(const ui::KeyEvent& event) {
   return false;
 }
 
+bool MenuButton::AcceleratorPressed(const ui::Accelerator& accelerator) {
+  // CustomButton::AcceleratorPressed ends up in NotifyClick, which doesn't work
+  // for menu buttons.
+  Activate();
+  return true;
+}
+
 void MenuButton::GetAccessibleState(ui::AXViewState* state) {
   CustomButton::GetAccessibleState(state);
   state->role = ui::AX_ROLE_POP_UP_BUTTON;