INPUT pattern attribute: Enable "unicode" flag.

third_party/WebKit/Source/core/html/forms/BaseTextInputType.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef BaseTextInputType_h
 #define BaseTextInputType_h
 
 #include "core/html/forms/TextFieldInputType.h"
 
 namespace blink {
 
+class ScriptRegexp;
+
 // Base of email, password, search, tel, text, and URL types.
 // They support maxlength, selection functions, and so on.
 class BaseTextInputType : public TextFieldInputType {
 protected:
-    BaseTextInputType(HTMLInputElement& element) : TextFieldInputType(element) { }
+    BaseTextInputType(HTMLInputElement&);
+    ~BaseTextInputType() override;
 
 private:
     bool tooLong(const String&, HTMLTextFormControlElement::NeedsToCheckDirtyFlag) const final;
     bool tooShort(const String&, HTMLTextFormControlElement::NeedsToCheckDirtyFlag) const final;
     int maxLength() const final;
     int minLength() const final;
     bool patternMismatch(const String&) const final;
     bool supportsPlaceholder() const final;
     bool supportsSelectionAPI() const override;
     bool supportsAutocapitalize() const override;
+
+    // m_regexp and m_patternForRegexp are mutable because they are kinds of
+    // cache.
+    mutable std::unique_ptr<ScriptRegexp> m_regexp;
+    mutable AtomicString m_patternForRegexp;
 };
 
 } // namespace blink
 
 #endif // BaseTextInputType_h