Add initial support for native Linux desktop notifications

chrome/browser/notifications/notification_platform_bridge_linux.h

Index: chrome/browser/notifications/notification_platform_bridge_linux.h
diff --git a/chrome/browser/notifications/notification_platform_bridge_linux.h b/chrome/browser/notifications/notification_platform_bridge_linux.h
new file mode 100644
index 0000000000000000000000000000000000000000..1b6380c769d270eabed7e47030326855b1a79d6f
--- /dev/null
+++ b/chrome/browser/notifications/notification_platform_bridge_linux.h
@@ -0,0 +1,38 @@
+// 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.
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_LINUX_H_
+#define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_LINUX_H_
+
+#include <gio/gio.h>
+
+#include "base/macros.h"
+#include "chrome/browser/notifications/notification_platform_bridge.h"
+
+class NotificationPlatformBridgeLinux : public NotificationPlatformBridge {
+ public:
+  explicit NotificationPlatformBridgeLinux(GDBusProxy* notification_proxy);
+
+  ~NotificationPlatformBridgeLinux() override;
+
+  // NotificationPlatformBridge:
+  void Display(NotificationCommon::Type notification_type,
+               const std::string& notification_id,
+               const std::string& profile_id,
+               bool is_incognito,
+               const Notification& notification) override;
+  void Close(const std::string& profile_id,
+             const std::string& notification_id) override;
+  void GetDisplayed(
+      const std::string& profile_id,
+      bool incognito,
+      const DisplayedNotificationsCallback& callback) const override;
+
+ private:
+  GDBusProxy* const notification_proxy_;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationPlatformBridgeLinux);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_LINUX_H_