Use schemas bundled in extensions to convert policies loaded on Windows.

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 658 matching lines @@
 
   Schema list = schema.GetKnownProperty("list");
   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());
 }
 
+TEST(SchemaTest, BackwardsCompatibility) {
+  const char kTestSchema[] =
+      "{"
+      "  \"type\": \"object\","
+      "  \"properties\": {"
+      "    \"magic\": { \"type\": \"array\" },"
+      "    \"no magic\": {"
+      "      \"type\": \"array\","
+      "      \"items\": { \"type\": \"boolean\" }"
+      "    }"
+      "  }"
+      "}";
+
+  {
+    std::string error;
+    Schema schema = Schema::Parse(kTestSchema, &error);
+    EXPECT_FALSE(schema.valid());
+    EXPECT_FALSE(error.empty());
+  }
+
+  std::string error;
+  Schema schema = Schema::ParseWithBackwardsCompatibility(
+      kTestSchema, &error, true);
+  ASSERT_TRUE(schema.valid()) << error;
+
+  Schema magic = schema.GetProperty("magic");
+  ASSERT_TRUE(magic.valid());
+  ASSERT_EQ(base::Value::TYPE_LIST, magic.type());
+  Schema items = magic.GetItems();
+  ASSERT_TRUE(items.valid());
+  EXPECT_EQ(base::Value::TYPE_STRING, items.type());
+
+  Schema nomagic = schema.GetProperty("no magic");
+  ASSERT_TRUE(nomagic.valid());
+  ASSERT_EQ(base::Value::TYPE_LIST, nomagic.type());
+  items = nomagic.GetItems();
+  ASSERT_TRUE(items.valid());
+  EXPECT_EQ(base::Value::TYPE_BOOLEAN, items.type());
+}
 
 }  // namespace policy