Ignore unknown attributes when parsing JSON schemas.

components/policy/core/common/schema_unittest.cc

 // Copyright 2013 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 "components/policy/core/common/schema.h"
 
 #include "components/policy/core/common/schema_internal.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace policy {
@@ skipping 93 matching lines @@
       "{"
       "  \"type\": \"object\","
       "  \"properties\": { \"Policy\": { \"type\": \"any\" } }"
       "}"));
 
   EXPECT_TRUE(ParseFails(
       "{"
       "  \"type\": \"object\","
       "  \"properties\": { \"Policy\": 123 }"
       "}"));
+
+  EXPECT_FALSE(ParseFails(
+      "{"
+      "  \"type\": \"object\","
+      "  \"unknown attribute\": \"is ignored\""
+      "}"));
 }
 
 TEST(SchemaTest, Ownership) {
   std::string error;
   Schema schema = Schema::Parse(
       "{"
       "  \"type\": \"object\","
       "  \"properties\": {"
       "    \"sub\": {"
       "      \"type\": \"object\","
@@ skipping 547 matching lines @@
   ASSERT_TRUE(list.valid());
   ASSERT_EQ(base::Value::TYPE_LIST, list.type());
 
   Schema items = list.GetItems();
   ASSERT_TRUE(items.valid());
   ASSERT_EQ(base::Value::TYPE_BOOLEAN, items.type());
 }
 
 
 }  // namespace policy