Add Mojo IPC based input-device service.

components/input_device_service/input_device_client.h

Index: components/input_device_service/input_device_client.h
diff --git a/components/input_device_service/input_device_client.h b/components/input_device_service/input_device_client.h
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+// 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_INPUT_DEVICE_SERVICE_INPUT_DEVICE_CLIENT_H_
+#define COMPONENTS_INPUT_DEVICE_SERVICE_INPUT_DEVICE_CLIENT_H_
+
+#include <array>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "components/input_device_service/input_device_service.mojom.h"
+#include "mojo/public/cpp/bindings/array.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "services/shell/public/cpp/connector.h"
+#include "ui/events/devices/input_device.h"
+#include "ui/events/devices/input_device_event_observer.h"
+#include "ui/events/devices/input_device_service.h"
+
+namespace input_device {
+
+// Listens for input device updates over Mojo IPC. Mirrors input device
+// information found in the mus-ws process.
+class InputDeviceClient : public mojom::InputDeviceObserver,
+                          public ui::InputDeviceService {
+ public:
+  InputDeviceClient();
+  ~InputDeviceClient() override;
+
+  void Initialize(shell::Connector* connector);
+
+  // mojom::InputDeviceObserver:
+  void OnKeyboardDeviceConfigurationChanged(
+      mojo::Array<ui::InputDevice> devices) override;
+  void OnTouchscreenDeviceConfigurationChanged(
+      mojo::Array<ui::InputDevice> devices) override;
+  void OnMouseDeviceConfigurationChanged(
+      mojo::Array<ui::InputDevice> devices) override;
+  void OnTouchpadDeviceConfigurationChanged(
+      mojo::Array<ui::InputDevice> devices) override;
+
+  void AddObserver(ui::InputDeviceEventObserver* observer) override;
+  void RemoveObserver(ui::InputDeviceEventObserver* observer) override;
+
+  const std::vector<ui::InputDevice>& keyboard_devices() override;
+  const std::vector<ui::InputDevice>& touchscreen_devices() override;
+  const std::vector<ui::InputDevice>& mouse_devices() override;
+  const std::vector<ui::InputDevice>& touchpad_devices() override;
+
+ private:
+  void RequestDeviceUpdates();
+
+  void UpdateKeyboardDevices(mojo::Array<ui::InputDevice> devices);
+  void UpdateTouchscreenDevices(mojo::Array<ui::InputDevice> devices);
+  void UpdateMouseDevices(mojo::Array<ui::InputDevice> devices);
+  void UpdateTouchpadDevices(mojo::Array<ui::InputDevice> devices);
+
+  std::vector<ui::InputDevice> keyboard_devices_;
+  std::vector<ui::InputDevice> touchscreen_devices_;
+  std::vector<ui::InputDevice> mouse_devices_;
+  std::vector<ui::InputDevice> touchpad_devices_;
+
+  mojom::InputDeviceServicePtr service_;
+  mojo::Binding<mojom::InputDeviceObserver> binding_;
+
+  // List of observers in this process.
+  base::ObserverList<ui::InputDeviceEventObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputDeviceClient);
+};
+
+}  // namespace input_device
+
+#endif  // COMPONENTS_INPUT_DEVICE_SERVICE_INPUT_DEVICE_CLIENT_H_