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 1b4c719f3c7af0f3bcbacd60ee931de3c12df6cf..559c43f4de8e05ad7f856d2fc66e8defb0aa061d 100644
--- a/ui/aura_shell/shell.h
+++ b/ui/aura_shell/shell.h
@@ -22,6 +22,9 @@ class Window;
 namespace gfx {
 class Rect;
 }
+namespace ui {
+class AcceleratorManager;
+}
 
 namespace aura_shell {
 
@@ -58,6 +61,11 @@ class AURA_SHELL_EXPORT Shell {
   ShellDelegate* delegate() { return delegate_.get(); }
   Launcher* launcher() { return launcher_.get(); }
 
+  // Returns the AcceleratorManager that managers global keyboard shortcuts.
+  ui::AcceleratorManager* accelerator_manager() {
+    return accelerator_manager_.get();
+  }
+
  private:
   typedef std::pair<aura::Window*, gfx::Rect> WindowAndBoundsPair;
 
@@ -82,6 +90,8 @@ class AURA_SHELL_EXPORT Shell {
   scoped_ptr<internal::WorkspaceController> workspace_controller_;
   scoped_ptr<internal::ShelfLayoutController> shelf_layout_controller_;
 
+  scoped_ptr<ui::AcceleratorManager> accelerator_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };