[Extensions Bindings] Add errors to signature parsing

extensions/renderer/api_invocation_errors.h

 // Copyright 2017 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.
 
 #ifndef EXTENSIONS_RENDERER_API_INVOCATION_ERRORS_H_
 #define EXTENSIONS_RENDERER_API_INVOCATION_ERRORS_H_
 
 #include <set>
 #include <string>
 
@@ skipping 25 matching lines @@
 std::string TooManyArrayItems(int maximum, int found);
 std::string TooFewStringChars(int minimum, int found);
 std::string TooManyStringChars(int maximum, int found);
 std::string NumberTooSmall(int minimum);
 std::string NumberTooLarge(int maximum);
 std::string InvalidType(const char* expected_type, const char* actual_type);
 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.
 std::string IndexError(uint32_t index, const std::string& error);
 
 // Returns a message indicating that an error was found while parsing a given
 // 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
 
 #endif  // EXTENSIONS_RENDERER_API_INVOCATION_ERRORS_H_