Show media router toolbar icon ephemerally for active local routes and issues

chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc

Index: chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc
diff --git a/chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc b/chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc
index 487a59a88d9ba57f538fb13f71c930c0a21db8ee..f5caf416c39ac2acde264880c6604e5153579d8a 100644
--- a/chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc
+++ b/chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc
@@ -8,6 +8,7 @@
 #include "base/lazy_instance.h"
 #include "chrome/browser/extensions/component_migration_helper.h"
 #include "chrome/browser/media/router/media_router_feature.h"
+#include "chrome/browser/media/router/media_router_ui_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/toolbar/toolbar_action_view_controller.h"
@@ -94,3 +95,8 @@ void ComponentToolbarActionsFactory::HandleComponentMigrations(
   }
 }
 
+void ComponentToolbarActionsFactory::InitializeComponentActionControllers(
+    Profile* profile) {
+  if (media_router::MediaRouterEnabled(profile))
+    media_router::MediaRouterUIService::Get(profile);

[Devlin, 2016/09/15 21:19:17]

Would this same effect be achieved by
KeyedServiceBasefactory::ServiceIsCreatedWithContext()?

[takumif, 2016/09/16 21:19:22]

Yes, using ServiceIsCreatedWithContext() (didn't know about it!) and
ServiceIsNULLWhileTesting() instead would work. I'll put those in the
MRUIServiceFactory once part 1 lands and that file gets created (I can't put it
in that CL since we can't instantiate MRUIService until this CL lands).

+}