chromeos: adds TouchDeviceServer and wires up in mushrome

ash/mus/touch_transform_setter_mus.h

Index: ash/mus/touch_transform_setter_mus.h
diff --git a/ash/mus/touch_transform_setter_mus.h b/ash/mus/touch_transform_setter_mus.h
new file mode 100644
index 0000000000000000000000000000000000000000..9fa73d8d49460d679111763d585847f125c45994
--- /dev/null
+++ b/ash/mus/touch_transform_setter_mus.h
@@ -0,0 +1,38 @@
+// Copyright 2017 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_TOUCH_TRANSFORM_SETTER_MUS_H_
+#define ASH_MUS_TOUCH_TRANSFORM_SETTER_MUS_H_
+
+#include "base/macros.h"
+#include "services/ui/public/interfaces/input_devices/touch_device_server.mojom.h"
+#include "ui/display/manager/chromeos/touch_transform_setter.h"
+
+namespace service_manager {
+class Connector;
+}
+
+namespace ash {
+
+// display::TouchTransformSetter implementation for mus. Updates are applied
+// by way of ui::mojom::TouchDeviceServer.
+class TouchTransformSetterMus : public display::TouchTransformSetter {
+ public:
+  explicit TouchTransformSetterMus(service_manager::Connector* connector);
+  ~TouchTransformSetterMus() override;
+
+  // TouchTransformSetter:
+  void ConfigureTouchDevices(
+      const std::map<int32_t, double>& scales,
+      const std::vector<display::TouchDeviceTransform>& transforms) override;
+
+ private:
+  ui::mojom::TouchDeviceServerPtr touch_device_server_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchTransformSetterMus);
+};
+
+}  // namespace ash
+
+#endif  // ASH_MUS_TOUCH_TRANSFORM_SETTER_MUS_H_