Make docked panel always on top for Linux

chrome/browser/ui/gtk/panels/panel_gtk.cc

Index: chrome/browser/ui/gtk/panels/panel_gtk.cc
diff --git a/chrome/browser/ui/gtk/panels/panel_gtk.cc b/chrome/browser/ui/gtk/panels/panel_gtk.cc
index 8118748bdcf33b2eec67e8dc7c3fce646c29be54..a3acd7b09626cf75ec0014ef50bff6947faffe24 100644
--- a/chrome/browser/ui/gtk/panels/panel_gtk.cc
+++ b/chrome/browser/ui/gtk/panels/panel_gtk.cc
@@ -316,6 +316,8 @@ void PanelGtk::Init() {
   gtk_widget_show(window_container_);
 
   ConnectAccelerators();
+
+  UpdateWindowAlwaysOnTopState();
 }
 
 void PanelGtk::SetWindowCornerStyle(panel::CornerStyle corner_style) {
@@ -1010,15 +1012,19 @@ void PanelGtk::SetPanelAlwaysOnTop(bool on_top) {
     return;
   always_on_top_ = on_top;
 
-  gtk_window_set_keep_above(window_, on_top);
+  UpdateWindowAlwaysOnTopState();
+}
+
+void PanelGtk::UpdateWindowAlwaysOnTopState() {
+  gtk_window_set_keep_above(window_, always_on_top_);
 
   // Do not show an icon in the task bar for always-on-top windows.
   // Window operations such as close, minimize etc. can only be done
   // from the panel UI.
-  gtk_window_set_skip_taskbar_hint(window_, on_top);
+  gtk_window_set_skip_taskbar_hint(window_, always_on_top_);
 
   // Show always-on-top windows on all the virtual desktops.
-  if (on_top)
+  if (always_on_top_)
     gtk_window_stick(window_);
   else
     gtk_window_unstick(window_);