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

components/policy/core/common/schema_unittest.cc

Index: components/policy/core/common/schema_unittest.cc
diff --git a/components/policy/core/common/schema_unittest.cc b/components/policy/core/common/schema_unittest.cc
index e0c1603e2c6ecc50c671af0a35d5bc93bbdd8970..980eadf5e9e1a50ec4dfee9a8ab8d8592dada775 100644
--- a/components/policy/core/common/schema_unittest.cc
+++ b/components/policy/core/common/schema_unittest.cc
@@ -676,5 +676,44 @@ TEST(SchemaTest, ItemsReference) {
   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