Chromecast: provides a method to check if config has been set by user.

chromecast/common/chromecast_config.cc

Index: chromecast/common/chromecast_config.cc
diff --git a/chromecast/common/chromecast_config.cc b/chromecast/common/chromecast_config.cc
index 0dc0da33af73ef0d575fc403f41fed1b658a323d..af5a591996589a020a616983f31afc26175b1600 100644
--- a/chromecast/common/chromecast_config.cc
+++ b/chromecast/common/chromecast_config.cc
@@ -138,4 +138,9 @@ void ChromecastConfig::SetIntValue(const std::string& key, int value) const {
   }
 }
 
+bool ChromecastConfig::HasValue(const std::string& key) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  return pref_service_->HasPrefPath(key.c_str());
+}
+
 }  // namespace chromecast