Add a policy to always show the Cast toolbar icon

chrome/browser/ui/toolbar/media_router_action_controller.cc

Index: chrome/browser/ui/toolbar/media_router_action_controller.cc
diff --git a/chrome/browser/ui/toolbar/media_router_action_controller.cc b/chrome/browser/ui/toolbar/media_router_action_controller.cc
index bc46d00cb20b96a8cddf54d9589457ef7f914065..fb7a4af4f4db288693b67e6f94368d1f5ffabab7 100644
--- a/chrome/browser/ui/toolbar/media_router_action_controller.cc
+++ b/chrome/browser/ui/toolbar/media_router_action_controller.cc
@@ -25,6 +25,18 @@ MediaRouterActionController::~MediaRouterActionController() {
   UnregisterObserver();  // media_router::IssuesObserver.
 }
 
+// static
+bool MediaRouterActionController::IsActionShownByPolicy(
+    content::BrowserContext* context) {
+  const PrefService::Preference* pref =
+      user_prefs::UserPrefs::Get(context)->FindPreference(
+          prefs::kShowCastIconInToolbar);
+  bool show = false;
+  if (pref->IsManaged())
+    pref->GetValue()->GetAsBoolean(&show);
+  return show;
+}
+
 void MediaRouterActionController::OnIssueUpdated(
     const media_router::Issue* issue) {
   has_issue_ = issue != nullptr;
@@ -65,7 +77,9 @@ MediaRouterActionController::MediaRouterActionController(
       media_router::MediaRoutesObserver(router),
       profile_(profile),
       component_action_delegate_(component_action_delegate),
-      component_migration_helper_(component_migration_helper) {
+      component_migration_helper_(component_migration_helper),
+      shown_by_policy_(
+          MediaRouterActionController::IsActionShownByPolicy(profile)) {
   DCHECK(profile_);
   RegisterObserver();  // media_router::IssuesObserver.
   pref_change_registrar_.Init(profile->GetPrefs());
@@ -90,7 +104,8 @@ void MediaRouterActionController::MaybeAddOrRemoveAction() {
 }
 
 bool MediaRouterActionController::ShouldEnableAction() const {
-  return has_local_display_route_ || has_issue_ || dialog_count_ ||
+  return shown_by_policy_ || has_local_display_route_ || has_issue_ ||
+         dialog_count_ ||
          component_migration_helper_->GetComponentActionPref(
              ComponentToolbarActionsFactory::kMediaRouterActionId);
 }