Cast audio only policy enforcement support.

extensions/browser/api/cast_channel/cast_auth_util.h

Index: extensions/browser/api/cast_channel/cast_auth_util.h
diff --git a/extensions/browser/api/cast_channel/cast_auth_util.h b/extensions/browser/api/cast_channel/cast_auth_util.h
index b68d211f9704fb41913a87b58426239bb69e757b..ac5a0a110a4c05422447a3c68c5d79d17f3ca4dc 100644
--- a/extensions/browser/api/cast_channel/cast_auth_util.h
+++ b/extensions/browser/api/cast_channel/cast_auth_util.h
@@ -33,6 +33,8 @@ struct AuthResult {
     ERROR_UNEXPECTED_AUTH_LIBRARY_RESULT
   };
 
+  enum PolicyType { POLICY_NONE = 0, POLICY_AUDIO_ONLY = 1 << 0 };
+
   // Constructs a AuthResult that corresponds to success.
   AuthResult();
   ~AuthResult();
@@ -48,6 +50,7 @@ struct AuthResult {
   std::string error_message;
   ErrorType error_type;
   int nss_error_code;
+  unsigned int channel_policies;
 
  private:
   AuthResult(const std::string& error_message,