Add initial support for native Linux desktop notifications

chrome/browser/browser_process_impl.cc

 // Copyright (c) 2012 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/browser_process_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 615 matching lines @@
 #if defined(OS_ANDROID)
   return nullptr;
 #else
   if (!created_notification_ui_manager_)
     CreateNotificationUIManager();
   return notification_ui_manager_.get();
 #endif
 }
 
 NotificationPlatformBridge* BrowserProcessImpl::notification_platform_bridge() {
-#if defined(OS_ANDROID) || defined(OS_MACOSX)
+#if defined(OS_ANDROID) || defined(OS_MACOSX) || \
+    (defined(OS_LINUX) && !defined(OS_CHROMEOS))
   if (!created_notification_bridge_)
     CreateNotificationPlatformBridge();
   return notification_bridge_.get();
 #else
   return nullptr;
 #endif
 }
 
 message_center::MessageCenter* BrowserProcessImpl::message_center() {
   DCHECK(CalledOnValidThread());
@@ skipping 508 matching lines @@
 }
 
 void BrowserProcessImpl::CreateIntranetRedirectDetector() {
   DCHECK(!intranet_redirect_detector_);
   std::unique_ptr<IntranetRedirectDetector> intranet_redirect_detector(
       new IntranetRedirectDetector);
   intranet_redirect_detector_.swap(intranet_redirect_detector);
 }
 
 void BrowserProcessImpl::CreateNotificationPlatformBridge() {
-#if (defined(OS_ANDROID) || defined(OS_MACOSX))
+#if defined(OS_ANDROID) || defined(OS_MACOSX) || \
+    (defined(OS_LINUX) && !defined(OS_CHROMEOS))
   DCHECK(!notification_bridge_);
   notification_bridge_.reset(NotificationPlatformBridge::Create());
   created_notification_bridge_ = true;
 #endif
 }
 
 void BrowserProcessImpl::CreateNotificationUIManager() {
 // Android does not use the NotificationUIManager anymore
 // All notification traffic is routed through NotificationPlatformBridge.
 #if !defined(OS_ANDROID)
@@ skipping 259 matching lines @@
 }
 
 void BrowserProcessImpl::OnAutoupdateTimer() {
   if (CanAutorestartForUpdate()) {
     DLOG(WARNING) << "Detected update.  Restarting browser.";
     RestartBackgroundInstance();
   }
 }
 
 #endif  // (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)