Add ShellAcceleratorController that manages global keyboard accelerators (2nd try).

ui/aura_shell/shell_accelerator_filter.h

Index: ui/aura_shell/shell_accelerator_filter.h
diff --git a/ui/aura_shell/shell_accelerator_filter.h b/ui/aura_shell/shell_accelerator_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..3e35ba64cd1410180b7c3c1ee878f62e3b1773e8
--- /dev/null
+++ b/ui/aura_shell/shell_accelerator_filter.h
@@ -0,0 +1,39 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_AURA_SHELL_SHELL_ACCELERATOR_FILTER_H_
+#define UI_AURA_SHELL_SHELL_ACCELERATOR_FILTER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/aura/event_filter.h"
+#include "ui/aura_shell/aura_shell_export.h"
+
+namespace aura_shell {
+namespace internal {
+
+// ShellAcceleratorFilter filters key events for ShellAcceleratorControler
+// handling global keyboard accelerators.
+class AURA_SHELL_EXPORT ShellAcceleratorFilter : public aura::EventFilter {
+ public:
+  ShellAcceleratorFilter();
+  virtual ~ShellAcceleratorFilter();
+
+  // Overridden from aura::EventFilter:
+  virtual bool PreHandleKeyEvent(aura::Window* target,
+                                 aura::KeyEvent* event) OVERRIDE;
+  virtual bool PreHandleMouseEvent(aura::Window* target,
+                                   aura::MouseEvent* event) OVERRIDE;
+  virtual ui::TouchStatus PreHandleTouchEvent(aura::Window* target,
+                                              aura::TouchEvent* event) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ShellAcceleratorFilter);
+};
+
+}  // namespace internal
+}  // namespace aura_shell
+
+#endif  // UI_AURA_SHELL_SHELL_ACCELERATOR_FILTER_H_