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

chromecast/common/chromecast_config.h

Index: chromecast/common/chromecast_config.h
diff --git a/chromecast/common/chromecast_config.h b/chromecast/common/chromecast_config.h
index 5cd6a1ae06fccffa47a4b1abf8b378fa1f899ef9..23482c6be4d876fa4f3f7ca8d54d10b14a740003 100644
--- a/chromecast/common/chromecast_config.h
+++ b/chromecast/common/chromecast_config.h
@@ -37,18 +37,21 @@ class ChromecastConfig {
   // Saves configs into configuration file.
   void Save() const;
 
-  // Returns string value for key, if present.
+  // Returns string value for |key|, if present.
   const std::string GetValue(const std::string& key) const;
 
-  // Returns integer value for key, if present.
+  // Returns integer value for |key|, if present.
   const int GetIntValue(const std::string& key) const;
 
-  // Sets new string value for key.
+  // Sets new string value for |key|.
   void SetValue(const std::string& key, const std::string& value) const;
 
-  // Sets new int value for key.
+  // Sets new int value for |key|.
   void SetIntValue(const std::string& key, int value) const;
 
+  // Whether or not a value has been set for |key|.
+  bool HasValue(const std::string& key) const;
+
   scoped_refptr<base::SequencedWorkerPool> worker_pool() const {
     return worker_pool_;
   }