Add Mojo IPC based input-device service.

components/mus/input_devices/touchscreen_device_struct_traits.h

Index: components/mus/input_devices/touchscreen_device_struct_traits.h
diff --git a/components/mus/input_devices/touchscreen_device_struct_traits.h b/components/mus/input_devices/touchscreen_device_struct_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..b8e8cc13b58236f794962c94365a3c3e8fb45478
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+++ b/components/mus/input_devices/touchscreen_device_struct_traits.h
@@ -0,0 +1,49 @@
+// 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 COMPONENTS_MUS_INPUT_DEVICES_TOUCHSCREEN_DEVICE_STRUCT_TRAITS_H_
+#define COMPONENTS_MUS_INPUT_DEVICES_TOUCHSCREEN_DEVICE_STRUCT_TRAITS_H_
+
+#include <string>
+
+#include "base/strings/string_piece.h"
+#include "components/mus/public/interfaces/input_devices/input_devices.mojom.h"
+#include "ui/events/devices/touchscreen_device.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<input_device::mojom::TouchscreenDevice,
+                    ui::TouchscreenDevice> {
+  static const ui::InputDevice& input_device(
+      const ui::TouchscreenDevice& device) {
+    return static_cast<const ui::InputDevice&>(device);
+  }
+
+  static gfx::Size size(const ui::TouchscreenDevice& device) {
+    return device.size;
+  }
+
+  static int32_t touch_points(const ui::TouchscreenDevice& device) {
+    return device.touch_points;
+  }
+
+  static bool Read(input_device::mojom::TouchscreenDeviceDataView data,
+                   ui::TouchscreenDevice* out) {
+    if (!data.ReadInputDevice(static_cast<ui::InputDevice*>(out)))
+      return false;
+
+    if (!data.ReadSize(&out->size))
+      return false;
+
+    out->touch_points = data.touch_points();
+
+    return true;
+  }
+};
+
+}  // namespace mojo
+
+#endif  // COMPONENTS_MUS_INPUT_DEVICES_TOUCHSCREEN_DEVICE_STRUCT_TRAITS_H_