Initial cut of ash/wm/common classes for mus

mash/wm/bridge/wm_lookup_mus.h

Index: mash/wm/bridge/wm_lookup_mus.h
diff --git a/mash/wm/bridge/wm_lookup_mus.h b/mash/wm/bridge/wm_lookup_mus.h
new file mode 100644
index 0000000000000000000000000000000000000000..72a8e40dc41a945194ce9974772e38b7636e01c5
--- /dev/null
+++ b/mash/wm/bridge/wm_lookup_mus.h
@@ -0,0 +1,34 @@
+// 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 MASH_WM_BRIDGE_WM_LOOKUP_MUS_H_
+#define MASH_WM_BRIDGE_WM_LOOKUP_MUS_H_
+
+#include <stdint.h>
+
+#include "ash/wm/common/wm_lookup.h"
+#include "base/macros.h"
+
+namespace mash {
+namespace wm {
+
+// WmLookup implementation for mus.
+class WmLookupMus : public ash::wm::WmLookup {
+ public:
+  WmLookupMus();
+  ~WmLookupMus() override;
+
+  // ash::wm::WmLookup:
+  ash::wm::WmRootWindowController* GetRootWindowControllerWithDisplayId(
+      int64_t id) override;
+  ash::wm::WmWindow* GetWindowForWidget(views::Widget* widget) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WmLookupMus);
+};
+
+}  // namespace wm
+}  // namespace mash
+
+#endif  // MASH_WM_BRIDGE_WM_LOOKUP_MUS_H_