Add initial support for native Linux desktop notifications

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index c33cfb5b45c39b76835c70a4a4a8b33cf8bd5114..0d2f78450a0036929d5f297e38c3fbe6e2374398 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2485,6 +2485,12 @@ const FeatureEntry kFeatureEntries[] = {
                                     kDelayNavigationFeatureVariations,
                                     "DelayNavigation")},
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+    {"use-system-notifications", flag_descriptions::kUseSystemNotificationsName,

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

Can you reuse "enable-native-notifications" (already included in this file) and
just enable it for Linux too?

[Tom (Use chromium acct), 2017/04/04 02:43:16]

Done.

+     flag_descriptions::kUseSystemNotificationsDescription, kOsLinux,
+     SINGLE_VALUE_TYPE(switches::kUseSystemNotifications)},
+#endif
+
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.