Notify ThemeService via callback when supervised user is ready.

chrome/browser/managed_mode/managed_user_service.cc

Index: chrome/browser/managed_mode/managed_user_service.cc
diff --git a/chrome/browser/managed_mode/managed_user_service.cc b/chrome/browser/managed_mode/managed_user_service.cc
index 90ad387264468304af96fa1e4a2b31797ae5c9c6..00795f32d90505f0ee37858142263ce4573f98e5 100644
--- a/chrome/browser/managed_mode/managed_user_service.cc
+++ b/chrome/browser/managed_mode/managed_user_service.cc
@@ -261,6 +261,11 @@ void ManagedUserService::DidBlockNavigation(
   }
 }
 
+void ManagedUserService::AddManagedUserInitCallback(
+    const base::Closure& callback) {
+  managed_user_init_callbacks_.push_back(callback);
+}
+
 std::string ManagedUserService::GetDebugPolicyProviderName() const {
   // Save the string space in official builds.
 #ifdef NDEBUG
@@ -570,6 +575,15 @@ void ManagedUserService::Init() {
   UpdateSiteLists();
   UpdateManualHosts();
   UpdateManualURLs();
+
+  // Call the callbacks to notify that the ManagedUserService has been
+  // initialized.
+  for (std::vector<base::Closure>::iterator it =
+           managed_user_init_callbacks_.begin();
+       it != managed_user_init_callbacks_.end();
+       ++it) {
+    it->Run();
+  }
 }
 
 void ManagedUserService::RegisterAndInitSync(