Add Mojo IPC based input-device service.

components/mus/input_devices/input_device_server.h

Index: components/mus/input_devices/input_device_server.h
diff --git a/components/mus/input_devices/input_device_server.h b/components/mus/input_devices/input_device_server.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_MUS_INPUT_DEVICES_INPUT_DEVICE_SERVER_H_
+#define COMPONENTS_MUS_INPUT_DEVICES_INPUT_DEVICE_SERVER_H_
+
+#include "base/macros.h"
+#include "components/mus/public/interfaces/input_devices/input_device_server.mojom.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
+#include "mojo/public/cpp/bindings/interface_ptr_set.h"
+#include "services/shell/public/cpp/connection.h"
+#include "services/shell/public/cpp/interface_factory.h"
+#include "ui/events/devices/device_data_manager.h"
+#include "ui/events/devices/input_device_event_observer.h"
+
+namespace input_device {
+
+// Listens to DeviceDataManager for updates on input-devices and forwards those
+// updates to any registered InputDeviceObserverMojo in other processes via
+// Mojo IPC. This runs in the mus-ws process.
+class InputDeviceServer
+    : public shell::InterfaceFactory<mojom::InputDeviceServer>,
+      public mojom::InputDeviceServer,
+      public ui::InputDeviceEventObserver {
+ public:
+  InputDeviceServer();
+  ~InputDeviceServer() override;
+
+  // Registers this instance as a local observer with DeviceDataManager.
+  void RegisterAsObserver();
+
+  // Registers interface with the shell connection so remote observers can
+  // connect. You should have already called RegisterAsObserver() to get
+  // local input-device event updates.
+  void RegisterInterface(shell::Connection* connection);
+
+  // mojom::InputDeviceServer:
+  void AddObserver(mojom::InputDeviceObserverMojoPtr observer) override;
+
+  // ui::InputDeviceEventObserver:
+  void OnKeyboardDeviceConfigurationChanged() override;
+  void OnTouchscreenDeviceConfigurationChanged() override;
+  void OnMouseDeviceConfigurationChanged() override;
+  void OnTouchpadDeviceConfigurationChanged() override;
+  void OnDeviceListsComplete() override;
+
+ private:
+  // Sends the current state of all input-devices to an observer.
+  void SendDeviceListsComplete(mojom::InputDeviceObserverMojo* observer);
+
+  // mojo::InterfaceFactory<mojom::InputDeviceServer>:
+  void Create(shell::Connection* connection,
+              mojom::InputDeviceServerRequest request) override;
+
+  mojo::BindingSet<mojom::InputDeviceServer> bindings_;
+  mojo::InterfacePtrSet<mojom::InputDeviceObserverMojo> observers_;
+
+  // DeviceDataManager instance we are registered as an observer with.
+  ui::DeviceDataManager* manager_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(InputDeviceServer);
+};
+
+}  // namespace input_device
+
+#endif  // COMPONENTS_MUS_INPUT_DEVICES_INPUT_DEVICE_SERVER_H_