Add initial support for native Linux desktop notifications

chrome/browser/notifications/dbus_notification_manager.cc

+// Copyright 2017 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 "chrome/browser/notifications/dbus_notification_manager.h"
+
+#include "base/strings/utf_string_conversions.h"
+
+namespace {
+
+const char kFreedesktopNotificationsName[] = "org.freedesktop.Notifications";
+const char kFreedesktopNotificationsPath[] = "/org/freedesktop/Notifications";
+
+}  // anonymous namespace
+
+// static
+DbusNotificationManager* DbusNotificationManager::CreateDbusNotificationManager(
+    message_center::MessageCenter* message_center) {
+  GDBusProxy* notification_proxy = g_dbus_proxy_new_for_bus_sync(
+      G_BUS_TYPE_SESSION,
+      static_cast<GDBusProxyFlags>(G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES |
+                                   G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS |
+                                   G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START),
+      nullptr, kFreedesktopNotificationsName, kFreedesktopNotificationsPath,
+      kFreedesktopNotificationsName, nullptr, nullptr);
+  if (notification_proxy)
+    return new DbusNotificationManager(message_center, notification_proxy);
+  return nullptr;
+}
+
+DbusNotificationManager::DbusNotificationManager(
+    message_center::MessageCenter* message_center,
+    GDBusProxy* notification_proxy)
+    : message_center_(message_center), notification_proxy_(notification_proxy) {
+  message_center_->AddObserver(this);
+}
+
+DbusNotificationManager::~DbusNotificationManager() {
+  g_object_unref(notification_proxy_);
+}
+
+void DbusNotificationManager::OnNotificationAdded(
+    const std::string& notification_id) {
+  // TODO(thomasanderson): Add a complete implemenatation.

[Peter Beverloo, 2017/04/03 23:39:29]

What's the best documentation I can read on the available features for these
notifications?

[Tom (Use chromium acct), 2017/04/04 02:43:17]

The Freedesktop notifications spec:
https://developer.gnome.org/notification-spec

+  message_center::Notification* notification =
+      message_center_->FindVisibleNotificationById(notification_id);
+  if (!notification)
+    return;
+  g_dbus_proxy_call(
+      notification_proxy_, "Notify",
+      g_variant_new("(susssasa{sv}i)", "", 0, "",
+                    base::UTF16ToUTF8(notification->title()).c_str(),
+                    base::UTF16ToUTF8(notification->message()).c_str(), nullptr,
+                    nullptr, -1),
+      G_DBUS_CALL_FLAGS_NONE, -1, nullptr, nullptr, nullptr);
+}
+
+void DbusNotificationManager::OnNotificationRemoved(
+    const std::string& notification_id,
+    bool by_user) {
+  NOTIMPLEMENTED();
+}
+
+void DbusNotificationManager::OnNotificationUpdated(
+    const std::string& notification_id) {
+  NOTIMPLEMENTED();
+}