Notify ThemeService via callback when supervised user is ready.

chrome/browser/ui/gtk/gtk_theme_service.cc

Index: chrome/browser/ui/gtk/gtk_theme_service.cc
diff --git a/chrome/browser/ui/gtk/gtk_theme_service.cc b/chrome/browser/ui/gtk/gtk_theme_service.cc
index 76befd6661be937399eacb7a37ab859e3e59f917..9ba14c501ba52c42d65417ffbd9746ba1c20a0fa 100644
--- a/chrome/browser/ui/gtk/gtk_theme_service.cc
+++ b/chrome/browser/ui/gtk/gtk_theme_service.cc
@@ -17,6 +17,7 @@
 #include "base/stl_util.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/themes/custom_theme_supplier.h"
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/browser.h"
@@ -347,10 +348,19 @@ void GtkThemeService::InitThemesFor(content::NotificationObserver* observer) {
 
 void GtkThemeService::SetTheme(const extensions::Extension* extension) {
   profile()->GetPrefs()->SetBoolean(prefs::kUsesSystemTheme, false);
+  use_gtk_ = false;
   LoadDefaultValues();
   ThemeService::SetTheme(extension);
 }
 
+void GtkThemeService::SetCustomDefaultTheme(
+    scoped_refptr<CustomThemeSupplier> theme_supplier) {
+  profile()->GetPrefs()->SetBoolean(prefs::kUsesSystemTheme, false);
+  use_gtk_ = false;
+  LoadDefaultValues();
+  ThemeService::SetCustomDefaultTheme(theme_supplier);
+}
+
 void GtkThemeService::UseDefaultTheme() {
   profile()->GetPrefs()->SetBoolean(prefs::kUsesSystemTheme, false);
   use_gtk_ = false;