Show the Cast toolbar icon ephemerally when Cast is in use

chrome/browser/profiles/profile.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/profiles/profile.h"
 
 #include <string>
 
 #include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 149 matching lines @@
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
   registry->RegisterBooleanPref(
       prefs::kMediaRouterEnableCloudServices,
       false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 #endif  // defined(GOOGLE_CHROME_BUILD)
   registry->RegisterBooleanPref(
       prefs::kMediaRouterFirstRunFlowAcknowledged,
       false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+  registry->RegisterBooleanPref(
+      prefs::kMediaRouterAlwaysShowActionIcon,
+      false,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 #endif
 
 #if defined(OS_CHROMEOS)
   registry->RegisterBooleanPref(prefs::kAllowScreenLock, true);
 #endif
 }
 
 std::string Profile::GetDebugName() {
   std::string name = GetPath().BaseName().MaybeAsASCII();
   if (name.empty()) {
@@ skipping 54 matching lines @@
   if (a->IsSameProfile(b))
     return false;
   return a->GetOriginalProfile() < b->GetOriginalProfile();
 }
 
 double Profile::GetDefaultZoomLevelForProfile() {
   return GetDefaultStoragePartition(this)
       ->GetHostZoomMap()
       ->GetDefaultZoomLevel();
 }