Add ShellAcceleratorController that managers global keyboard accelerators.

ui/aura_shell/shell.cc

Index: ui/aura_shell/shell.cc
diff --git a/ui/aura_shell/shell.cc b/ui/aura_shell/shell.cc
index dc40423beb690ee3840f3c19588454a8548f6f58..79cf3f2f4facec95f9fc83d1ba88c9e69bd6950f 100644
--- a/ui/aura_shell/shell.cc
+++ b/ui/aura_shell/shell.cc
@@ -23,6 +23,7 @@
 #include "ui/aura_shell/toplevel_layout_manager.h"
 #include "ui/aura_shell/toplevel_window_event_filter.h"
 #include "ui/aura_shell/workspace_controller.h"
+#include "ui/base/accelerator_manager.h"
 #include "ui/gfx/compositor/layer.h"
 #include "ui/gfx/compositor/layer_animator.h"
 #include "views/widget/native_widget_aura.h"
@@ -84,7 +85,8 @@ Shell* Shell::instance_ = NULL;
 
 Shell::Shell(ShellDelegate* delegate)
     : ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)),
-      delegate_(delegate) {
+      delegate_(delegate),
+      accelerator_manager_(new ui::AcceleratorManager) {
   aura::Desktop::GetInstance()->SetEventFilter(
       new internal::DesktopEventFilter);
   aura::Desktop::GetInstance()->SetStackingClient(
@@ -167,6 +169,8 @@ void Shell::Init() {
     toplevel_layout_manager->set_shelf(shelf_layout_controller_.get());
   }
 
+  desktop_window->RegisterAccelerators(accelerator_manager());
+
   // Force a layout.
   desktop_layout->OnWindowResized();
 }