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..fc3263db4c5bcdcfbf3413509eb59dcf57bf5239 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"
@@ -60,10 +61,10 @@ class ASH_EXPORT AcceleratorController
     RESTRICTION_PREVENT_PROCESSING_AND_PROPAGATION
   };
 
-  // Registers a global keyboard accelerator for the specified target. If
-  // multiple targets are registered for an accelerator, a target registered
-  // later has higher priority.
-  void Register(const ui::Accelerator& accelerator,
+  // Registers global keyboard accelerators for the specified target. If
+  // multiple targets are registered for any given accelerator, a target
+  // registered later has higher priority.
+  void Register(const std::vector<ui::Accelerator>& accelerators,
                 ui::AcceleratorTarget* target);
 
   // Unregisters the specified keyboard accelerator for the specified target.