Add Mojo IPC based input-device service.

components/mus/input_devices/input_device_server.cc

Index: components/mus/input_devices/input_device_server.cc
diff --git a/components/mus/input_devices/input_device_server.cc b/components/mus/input_devices/input_device_server.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f028a40d27b4c713aae7306e153b832fb33a0733
--- /dev/null
+++ b/components/mus/input_devices/input_device_server.cc
@@ -0,0 +1,119 @@
+// 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/input_devices/input_device_server.h"
+
+#include <utility>
+#include <vector>
+
+#include "mojo/public/cpp/bindings/array.h"
+#include "ui/events/devices/input_device.h"
+#include "ui/events/devices/touchscreen_device.h"
+
+namespace input_device {
+
+InputDeviceServer::InputDeviceServer() {}
+
+InputDeviceServer::~InputDeviceServer() {
+  if (manager_ && ui::DeviceDataManager::HasInstance()) {
+    manager_->RemoveObserver(this);
+    manager_ = nullptr;
+  }
+}
+
+void InputDeviceServer::RegisterAsObserver() {
+  if (!manager_) {
+    manager_ = ui::DeviceDataManager::GetInstance();
+    manager_->AddObserver(this);
+  }
+}
+
+void InputDeviceServer::RegisterInterface(shell::Connection* connection) {
+  DCHECK(manager_);
+  connection->AddInterface<mojom::InputDeviceServer>(this);
+}
+
+void InputDeviceServer::Create(shell::Connection* connection,
+                               mojom::InputDeviceServerRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+void InputDeviceServer::AddObserver(
+    mojom::InputDeviceObserverMojoPtr observer) {
+  SendInputDeviceState(observer.get());
+  observers_.AddPtr(std::move(observer));
+}
+
+void InputDeviceServer::OnKeyboardDeviceConfigurationChanged() {
+  auto& devices = manager_->GetKeyboardDevices();
+  observers_.ForAllPtrs([&devices](mojom::InputDeviceObserverMojo* observer) {
+    observer->OnKeyboardDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(devices));
+  });
+}
+
+void InputDeviceServer::OnTouchscreenDeviceConfigurationChanged() {
+  auto& devices = manager_->GetTouchscreenDevices();
+  observers_.ForAllPtrs([&devices](mojom::InputDeviceObserverMojo* observer) {
+    observer->OnTouchscreenDeviceConfigurationChanged(
+        mojo::Array<ui::TouchscreenDevice>::From(devices));
+  });
+}
+
+void InputDeviceServer::OnMouseDeviceConfigurationChanged() {
+  auto& devices = manager_->GetMouseDevices();
+  observers_.ForAllPtrs([&devices](mojom::InputDeviceObserverMojo* observer) {
+    observer->OnMouseDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(devices));
+  });
+}
+
+void InputDeviceServer::OnTouchpadDeviceConfigurationChanged() {
+  auto& devices = manager_->GetTouchpadDevices();
+  observers_.ForAllPtrs([&devices](mojom::InputDeviceObserverMojo* observer) {
+    observer->OnTouchpadDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(devices));
+  });
+}
+
+void InputDeviceServer::OnDeviceListsComplete() {
+  observers_.ForAllPtrs([](mojom::InputDeviceObserverMojo* observer) {
+    observer->OnDeviceListsComplete();
+  });
+}
+
+void InputDeviceServer::SendInputDeviceState(
+    mojom::InputDeviceObserverMojo* observer) {
+  auto& keyboard_devices = manager_->GetKeyboardDevices();
+  if (!keyboard_devices.empty()) {
+    observer->OnKeyboardDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(keyboard_devices));
+  }
+
+  auto& touchscreen_devices = manager_->GetTouchscreenDevices();
+  if (!touchscreen_devices.empty()) {
+    observer->OnTouchscreenDeviceConfigurationChanged(
+        mojo::Array<ui::TouchscreenDevice>::From(touchscreen_devices));
+  }
+
+  auto& mouse_devices = manager_->GetMouseDevices();
+  if (!mouse_devices.empty()) {
+    observer->OnMouseDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(mouse_devices));
+  }
+
+  auto& touchpad_devices = manager_->GetTouchpadDevices();
+  if (!touchpad_devices.empty()) {
+    observer->OnTouchpadDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(touchpad_devices));
+  }
+
+  // We only want to send this message once, so we need to check to make sure
+  // device lists are actually complete before sending it to a new observer.
+  if (manager_->AreDeviceListsComplete()) {
+    observer->OnDeviceListsComplete();
+  }
+}
+
+}  // namespace input_device