Make HasAutocompleteAttributeValue handle multi-valued strings

components/autofill/core/common/autofill_util.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_UTIL_H_
 #define COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_UTIL_H_
 
 #include <stddef.h>
 
+#include <string>
+#include <vector>
+
 #include "base/strings/string16.h"
 #include "components/autofill/core/common/form_field_data.h"
 
 namespace autofill {
 
 // Returns true when command line switch |kEnableSuggestionsWithSubstringMatch|
 // is on.
 bool IsFeatureSubstringMatchEnabled();
 
 // Returns true when keyboard accessory is enabled.
@@ skipping 24 matching lines @@
 bool IsDesktopPlatform();
 
 bool ShouldSkipField(const FormFieldData& field);
 
 bool IsCheckable(const FormFieldData::CheckStatus& check_status);
 bool IsChecked(const FormFieldData::CheckStatus& check_status);
 void SetCheckStatus(FormFieldData* form_field_data,
                     bool isCheckable,
                     bool isChecked);
 
+// Lowercases and tokenizes a given |attribute| string.
+// Considers any ASCII whitespace character as a possible separator.
+// Also ignores empty tokens, resulting in a collapsing of whitespace.
+std::vector<std::string> LowercaseAndTokenizeAttributeString(
+    const std::string& attribute);
+
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_UTIL_H_