Linux native notifications: Add notify and close tests

chrome/browser/notifications/notification_platform_bridge_linux.cc

Index: chrome/browser/notifications/notification_platform_bridge_linux.cc
diff --git a/chrome/browser/notifications/notification_platform_bridge_linux.cc b/chrome/browser/notifications/notification_platform_bridge_linux.cc
index bd3d2d3f9e62c300de600dba078b6441f7df4e57..e813db39afc646517996587f4b02653110940900 100644
--- a/chrome/browser/notifications/notification_platform_bridge_linux.cc
+++ b/chrome/browser/notifications/notification_platform_bridge_linux.cc
@@ -55,6 +55,8 @@ enum class ConnectionInitializationStatusCode {
 };
 
 gfx::Image DeepCopyImage(const gfx::Image& image) {
+  if (image.IsEmpty())
+    return gfx::Image();
   std::unique_ptr<gfx::ImageSkia> image_skia(image.CopyImageSkia());
   return gfx::Image(*image_skia);
 }