Make mash register initial batch of accelerators in single shot.

ash/common/accelerators/accelerator_controller.h

Index: ash/common/accelerators/accelerator_controller.h
diff --git a/ash/common/accelerators/accelerator_controller.h b/ash/common/accelerators/accelerator_controller.h
index 38b9007edbebd90702c6fd39435788865b64e1ff..9417f743125e22ad9e45479842d3a4b4db87fecd 100644
--- a/ash/common/accelerators/accelerator_controller.h
+++ b/ash/common/accelerators/accelerator_controller.h
@@ -10,6 +10,7 @@
 #include <map>
 #include <memory>
 #include <set>
+#include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/common/accelerators/accelerator_table.h"
@@ -66,6 +67,8 @@ class ASH_EXPORT AcceleratorController
   void Register(const ui::Accelerator& accelerator,
                 ui::AcceleratorTarget* target);
 
+  void Registers(std::vector<ui::Accelerator>& ui_accelerators);
+
   // Unregisters the specified keyboard accelerator for the specified target.
   void Unregister(const ui::Accelerator& accelerator,
                   ui::AcceleratorTarget* target);