Add regular expression support in json_schema component

components/json_schema/json_schema_validator_unittest.cc

Index: components/json_schema/json_schema_validator_unittest.cc
diff --git a/components/json_schema/json_schema_validator_unittest.cc b/components/json_schema/json_schema_validator_unittest.cc
index 73809de5c860fd2b52a5b23a862fcc7e36994cfe..aaa255568505073b90b5b1b2a08f29ff263c3c01 100644
--- a/components/json_schema/json_schema_validator_unittest.cc
+++ b/components/json_schema/json_schema_validator_unittest.cc
@@ -9,9 +9,7 @@
 
 class JSONSchemaValidatorCPPTest : public JSONSchemaValidatorTestBase {
  public:
-  JSONSchemaValidatorCPPTest()
-      : JSONSchemaValidatorTestBase(JSONSchemaValidatorTestBase::CPP) {
-  }
+  JSONSchemaValidatorCPPTest() : JSONSchemaValidatorTestBase() {}
 
  protected:
   virtual void ExpectValid(const std::string& test_source,
@@ -134,6 +132,19 @@ TEST(JSONSchemaValidator, IsValidSchema) {
   EXPECT_TRUE(JSONSchemaValidator::IsValidSchema(
       "{"
       "  \"type\": \"object\","
+      "  \"patternProperties\": {"
+      "    \".\": { \"type\": \"any\" },"
+      "    \"foo\": { \"type\": \"any\" },"
+      "    \"^foo$\": { \"type\": \"any\" },"
+      "    \"foo+\": { \"type\": \"any\" },"
+      "    \"foo?\": { \"type\": \"any\" },"
+      "    \"fo{2,4}\": { \"type\": \"any\" },"
+      "    \"(left)|(right)\": { \"type\": \"any\" }"
+      "  }"
+      "}", &error)) << error;
+  EXPECT_TRUE(JSONSchemaValidator::IsValidSchema(
+      "{"
+      "  \"type\": \"object\","
       "  \"unknown attribute\": \"that should just be ignored\""
       "}",
       JSONSchemaValidator::OPTIONS_IGNORE_UNKNOWN_ATTRIBUTES,