Register global accelerators and add placeholders for handling them.

ui/aura_shell/shell_accelerator_controller.h

Index: ui/aura_shell/shell_accelerator_controller.h
diff --git a/ui/aura_shell/shell_accelerator_controller.h b/ui/aura_shell/shell_accelerator_controller.h
index 86fe41b9b3adfce1d29c157f1df1b87360fec682..d0bb7028b213870e5d9e7e8d90eb57c08416bff9 100644
--- a/ui/aura_shell/shell_accelerator_controller.h
+++ b/ui/aura_shell/shell_accelerator_controller.h
@@ -6,6 +6,8 @@
 #define UI_AURA_SHELL_SHELL_ACCELERATOR_CONTROLLER_H_
 #pragma once
 
+#include <map>
+
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ -52,8 +54,14 @@ class AURA_SHELL_EXPORT ShellAcceleratorController
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
 
  private:
+  // Initialize the accelerators this class handles as a target.
+  void Init();
+
   scoped_ptr<ui::AcceleratorManager> accelerator_manager_;
 
+  // A map from accelerators to action IDs used in the implementation.
+  std::map<ui::Accelerator, int> accelerators_;
+
   DISALLOW_COPY_AND_ASSIGN(ShellAcceleratorController);
 };