Added a validator for JSON v3 schemas.

chrome/common/json_schema/json_schema_constants.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/common/json_schema/json_schema_constants.h"
 
 namespace json_schema_constants {
 
 const char kAdditionalProperties[] = "additionalProperties";
 const char kAny[] = "any";
 const char kArray[] = "array";
 const char kBoolean[] = "boolean";
 const char kChoices[] = "choices";
 const char kEnum[] = "enum";
 const char kId[] = "id";
 const char kInteger[] = "integer";
 const char kItems[] = "items";
 const char kMaximum[] = "maximum";
 const char kMaxItems[] = "maxItems";
 const char kMaxLength[] = "maxLength";
 const char kMinimum[] = "minimum";
 const char kMinItems[] = "minItems";
 const char kMinLength[] = "minLength";
 const char kNull[] = "null";
 const char kNumber[] = "number";
 const char kObject[] = "object";
 const char kOptional[] = "optional";
 const char kPattern[] = "pattern";
+const char kPatternProperties[] = "patternProperties";
 const char kProperties[] = "properties";
 const char kRef[] = "$ref";
+const char kSchema[] = "$schema";
 const char kString[] = "string";
 const char kType[] = "type";
 
 }  // namespace json_schema_constants