[Extensions Bindings] Add errors to signature parsing

extensions/renderer/api_invocation_errors.h

Index: extensions/renderer/api_invocation_errors.h
diff --git a/extensions/renderer/api_invocation_errors.h b/extensions/renderer/api_invocation_errors.h
index 4458b6dcc315beb2695ffdbce527548fcda62002..b52340615d65ea2fc86646c558d39aa2d4ab8c51 100644
--- a/extensions/renderer/api_invocation_errors.h
+++ b/extensions/renderer/api_invocation_errors.h
@@ -43,6 +43,8 @@ std::string NotAnInstance(const char* instance_type);
 std::string InvalidChoice();
 std::string UnserializableValue();
 std::string ScriptThrewError();
+std::string TooManyArguments();
+std::string MissingRequiredArgument(const char* argument_name);
 
 // Returns an message indicating an error was found while parsing a given index
 // in an array.
@@ -52,6 +54,11 @@ std::string IndexError(uint32_t index, const std::string& error);
 // property on an object.
 std::string PropertyError(const char* property_name, const std::string& error);
 
+// Returns a message indicating that an error was found while parsing a given
+// parameter in an API signature.
+std::string ArgumentError(const std::string& parameter_name,
+                          const std::string& error);
+
 }  // namespace api_errors
 }  // namespace extensions