Enable keyboard accelerators while a menu is open

ash/accelerators/accelerator_controller.h

Index: ash/accelerators/accelerator_controller.h
diff --git a/ash/accelerators/accelerator_controller.h b/ash/accelerators/accelerator_controller.h
index de9608ecb4acd4a8e1616f4e66596bc14003b0d1..6dc7c057a2f4842e79d4f6ab584a2ee611dd8d6d 100644
--- a/ash/accelerators/accelerator_controller.h
+++ b/ash/accelerators/accelerator_controller.h
@@ -113,6 +113,13 @@ class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
     return &exit_warning_handler_;
   }
 
+  // Checks if the given accelerator can be performed without the need to close
+  // the menu (if one is present), returns true if this is the case, and false
+  // otherwise (the menu should be closed and the accelerator should continue
+  // its normal propagation).
+  bool ShouldMenuBeKeptOpenForAccelerator(
+      const ui::Accelerator& accelerator) const;
+
   ui::AcceleratorHistory* accelerator_history() {
     return accelerator_history_.get();
   }
@@ -192,6 +199,8 @@ class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
   std::set<int> actions_allowed_in_app_mode_;
   // Actions disallowed if there are no windows.
   std::set<int> actions_needing_window_;
+  // Actions that can be performed without closing the menu (if one is present).
+  std::set<int> actions_keeping_menu_open_;
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratorController);
 };