mus: Add PointerWatcher for passively observing mouse and touch events

ash/mus/pointer_watcher_delegate_mus.h

Index: ash/mus/pointer_watcher_delegate_mus.h
diff --git a/ash/mus/pointer_watcher_delegate_mus.h b/ash/mus/pointer_watcher_delegate_mus.h
new file mode 100644
index 0000000000000000000000000000000000000000..ed7e0426ed448d5eabb8d9dadc6e89da693fe5fc
--- /dev/null
+++ b/ash/mus/pointer_watcher_delegate_mus.h
@@ -0,0 +1,29 @@
+// 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_POINTER_WATCHER_DELEGATE_MUS_H_
+#define ASH_MUS_POINTER_WATCHER_DELEGATE_MUS_H_
+
+#include "ash/pointer_watcher_delegate.h"
+#include "base/macros.h"
+
+namespace ash {
+
+// PointerWatcher support on mus via the WindowManagerConnection.
+class PointerWatcherDelegateMus : public PointerWatcherDelegate {
+ public:
+  PointerWatcherDelegateMus();
+  ~PointerWatcherDelegateMus() override;
+
+  // PointerWatcherDelegate:
+  void AddPointerWatcher(views::PointerWatcher* watcher) override;
+  void RemovePointerWatcher(views::PointerWatcher* watcher) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PointerWatcherDelegateMus);
+};
+
+}  // namespace ash
+
+#endif  // ASH_MUS_POINTER_WATCHER_DELEGATE_MUS_H_