Get AcceleratorControllerTest working with mash

ash/mus/bridge/wm_shell_mus_test_api.h

Index: ash/mus/bridge/wm_shell_mus_test_api.h
diff --git a/ash/mus/bridge/wm_shell_mus_test_api.h b/ash/mus/bridge/wm_shell_mus_test_api.h
new file mode 100644
index 0000000000000000000000000000000000000000..df73a718a7fa8e93d2c5b496278617c173c87d4f
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+++ b/ash/mus/bridge/wm_shell_mus_test_api.h
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+// Copyright 2016 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 ASH_MUS_BRIDGE_WM_SHELL_MUS_TEST_API_H_
+#define ASH_MUS_BRIDGE_WM_SHELL_MUS_TEST_API_H_
+
+#include "ash/mus/bridge/wm_shell_mus.h"
+
+namespace ash {
+namespace mus {
+
+// Use to get at internal state of WmShellMus.
+class WmShellMusTestApi {
+ public:
+  WmShellMusTestApi() {}
+  ~WmShellMusTestApi() {}
+
+  AcceleratorControllerRegistrar* accelerator_controller_registrar() {
+    return WmShellMus::Get()->accelerator_controller_registrar_.get();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WmShellMusTestApi);
+};
+
+}  // namespace mus
+}  // namespace ash
+
+#endif  // ASH_MUS_BRIDGE_WM_SHELL_MUS_TEST_API_H_