Add Mojo IPC based input-device service.

components/mus/input_devices/input_device_struct_traits.h

Index: components/mus/input_devices/input_device_struct_traits.h
diff --git a/components/mus/input_devices/input_device_struct_traits.h b/components/mus/input_devices/input_device_struct_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..41434011560005f84f2faf51ae08357c77cdb96f
--- /dev/null
+++ b/components/mus/input_devices/input_device_struct_traits.h
@@ -0,0 +1,81 @@
+// 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_INPUT_DEVICE_STRUCT_TRAITS_H_
+#define COMPONENTS_MUS_INPUT_DEVICES_INPUT_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/input_device.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<input_device::mojom::InputDevice, ui::InputDevice> {
+  static int32_t id(const ui::InputDevice& device) { return device.id; }
+
+  static input_device::mojom::InputDeviceType type(
+      const ui::InputDevice& device) {
+    switch (device.type) {
+      case ui::INPUT_DEVICE_INTERNAL:
+        return input_device::mojom::InputDeviceType::INPUT_DEVICE_INTERNAL;
+      case ui::INPUT_DEVICE_EXTERNAL:
+        return input_device::mojom::InputDeviceType::INPUT_DEVICE_EXTERNAL;
+      case ui::INPUT_DEVICE_UNKNOWN:
+        return input_device::mojom::InputDeviceType::INPUT_DEVICE_UNKNOWN;
+    }
+  }
+
+  static std::string name(const ui::InputDevice& device) { return device.name; }
+
+  static base::StringPiece sys_path(const ui::InputDevice& device) {
+    return device.sys_path.AsUTF8Unsafe();
+  }
+
+  static uint32_t vendor_id(const ui::InputDevice& device) {
+    return device.vendor_id;
+  }
+
+  static uint32_t product_id(const ui::InputDevice& device) {
+    return device.product_id;
+  }
+
+  static bool Read(input_device::mojom::InputDeviceDataView data,
+                   ui::InputDevice* out) {
+    out->id = data.id();
+
+    switch (data.type()) {
+      case input_device::mojom::InputDeviceType::INPUT_DEVICE_INTERNAL:
+        out->type = ui::INPUT_DEVICE_INTERNAL;
+        break;
+      case input_device::mojom::InputDeviceType::INPUT_DEVICE_EXTERNAL:
+        out->type = ui::INPUT_DEVICE_EXTERNAL;
+        break;
+      case input_device::mojom::InputDeviceType::INPUT_DEVICE_UNKNOWN:
+        out->type = ui::INPUT_DEVICE_UNKNOWN;
+        break;
+      default:
+        return false;
+    }
+
+    if (!data.ReadName(&out->name))
+      return false;
+
+    base::StringPiece sys_path_string;
+    if (!data.ReadSysPath(&sys_path_string))
+      return false;
+    out->sys_path = base::FilePath::FromUTF8Unsafe(sys_path_string);
+
+    out->vendor_id = data.vendor_id();
+    out->product_id = data.product_id();
+
+    return true;
+  }
+};
+
+}  // namespace mojo
+
+#endif  // COMPONENTS_MUS_INPUT_DEVICES_INPUT_DEVICE_STRUCT_TRAITS_H_