Add ShellAcceleratorController that managers global keyboard accelerators.

ui/aura_shell/shell.h

Index: ui/aura_shell/shell.h
diff --git a/ui/aura_shell/shell.h b/ui/aura_shell/shell.h
index 75643c558c75ae3b6aa2cb766d880dd1f484b804..c74fb6c80213e597371a5ac2beef8825ba718430 100644
--- a/ui/aura_shell/shell.h
+++ b/ui/aura_shell/shell.h
@@ -27,6 +27,7 @@ class Rect;
 namespace aura_shell {
 
 class Launcher;
+class ShellAcceleratorController;
 class ShellDelegate;
 
 namespace internal {
@@ -60,6 +61,9 @@ class AURA_SHELL_EXPORT Shell {
   // Toggles between overview mode and normal mode.
   void ToggleOverview();
 
+  ShellAcceleratorController* accelerator_controller() {
+    return accelerator_controller_.get();
+  }
   ShellDelegate* delegate() { return delegate_.get(); }
   Launcher* launcher() { return launcher_.get(); }
 
@@ -80,6 +84,8 @@ class AURA_SHELL_EXPORT Shell {
 
   base::WeakPtrFactory<Shell> method_factory_;
 
+  scoped_ptr<ShellAcceleratorController> accelerator_controller_;
+
   scoped_ptr<ShellDelegate> delegate_;
 
   scoped_ptr<Launcher> launcher_;