Add Mojo IPC based input-device service.

components/mus/public/cpp/input_devices/input_device_client.cc

+// 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.
+
+#include "components/mus/public/cpp/input_devices/input_device_client.h"
+
+#include "base/logging.h"
+
+namespace input_device {
+
+InputDeviceClient::InputDeviceClient() : binding_(this) {
+  InputDeviceManager::SetInstance(this);
+}
+
+InputDeviceClient::~InputDeviceClient() {
+  InputDeviceManager::ClearInstance();
+}
+
+void InputDeviceClient::Connect(mojom::InputDeviceServerPtr server) {
+  DCHECK(server.is_bound());
+
+  // Add this class as an observer via Mojo IPC.

[sadrul, 2016/06/10 18:01:49]

The comment isn't necessary

[kylechar, 2016/06/10 19:29:31]

Done.

+  server->AddObserver(binding_.CreateInterfacePtrAndBind());
+}
+
+void InputDeviceClient::OnKeyboardDeviceConfigurationChanged(
+    mojo::Array<ui::InputDevice> devices) {
+  keyboard_devices_ = devices.To<std::vector<ui::InputDevice>>();
+  FOR_EACH_OBSERVER(ui::InputDeviceEventObserver, observers_,
+                    OnKeyboardDeviceConfigurationChanged());
+}
+
+void InputDeviceClient::OnTouchscreenDeviceConfigurationChanged(
+    mojo::Array<ui::TouchscreenDevice> devices) {
+  touchscreen_devices_ = devices.To<std::vector<ui::TouchscreenDevice>>();
+  FOR_EACH_OBSERVER(ui::InputDeviceEventObserver, observers_,
+                    OnTouchscreenDeviceConfigurationChanged());
+}
+
+void InputDeviceClient::OnMouseDeviceConfigurationChanged(
+    mojo::Array<ui::InputDevice> devices) {
+  mouse_devices_ = devices.To<std::vector<ui::InputDevice>>();
+  FOR_EACH_OBSERVER(ui::InputDeviceEventObserver, observers_,
+                    OnMouseDeviceConfigurationChanged());
+}
+
+void InputDeviceClient::OnTouchpadDeviceConfigurationChanged(
+    mojo::Array<ui::InputDevice> devices) {
+  touchpad_devices_ = devices.To<std::vector<ui::InputDevice>>();
+  FOR_EACH_OBSERVER(ui::InputDeviceEventObserver, observers_,
+                    OnTouchpadDeviceConfigurationChanged());
+}
+
+void InputDeviceClient::OnDeviceListsComplete(
+    mojo::Array<ui::InputDevice> keyboard_devices,

[sadrul, 2016/06/10 18:01:49]

It may be nice to have struct-traits take care of this so we can use
std::vector<> here.

[kylechar, 2016/06/10 19:29:31]

That would be ideal but I don't think Mojo supports that yet? I can't find any
examples at least.

+    mojo::Array<ui::TouchscreenDevice> touchscreen_devices,
+    mojo::Array<ui::InputDevice> mouse_devices,
+    mojo::Array<ui::InputDevice> touchpad_devices) {
+  // Update the cached device lists if the received list isn't empty.
+  if (!keyboard_devices.empty())
+    OnKeyboardDeviceConfigurationChanged(std::move(keyboard_devices));
+  if (!touchscreen_devices.empty())
+    OnTouchscreenDeviceConfigurationChanged(std::move(touchscreen_devices));
+  if (!mouse_devices.empty())
+    OnMouseDeviceConfigurationChanged(std::move(mouse_devices));
+  if (!touchpad_devices.empty())
+    OnTouchpadDeviceConfigurationChanged(std::move(touchpad_devices));
+
+  if (!device_lists_complete_) {
+    device_lists_complete_ = true;
+    FOR_EACH_OBSERVER(ui::InputDeviceEventObserver, observers_,
+                      OnDeviceListsComplete());
+  }
+}
+
+void InputDeviceClient::AddObserver(ui::InputDeviceEventObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void InputDeviceClient::RemoveObserver(ui::InputDeviceEventObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+const std::vector<ui::InputDevice>& InputDeviceClient::GetKeyboardDevices()
+    const {
+  return keyboard_devices_;
+}
+
+const std::vector<ui::TouchscreenDevice>&
+InputDeviceClient::GetTouchscreenDevices() const {
+  return touchscreen_devices_;
+}
+
+const std::vector<ui::InputDevice>& InputDeviceClient::GetMouseDevices() const {
+  return mouse_devices_;
+}
+
+const std::vector<ui::InputDevice>& InputDeviceClient::GetTouchpadDevices()
+    const {
+  return touchpad_devices_;
+}
+
+bool InputDeviceClient::AreDeviceListsComplete() const {
+  return device_lists_complete_;
+}
+
+bool InputDeviceClient::AreTouchscreensEnabled() const {
+  // TODO(kylechar): This obviously isn't right. We either need to pass this
+  // state around or modify the interface.
+  return true;
+}
+
+}  // namespace input_device