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diff --git a/chrome/browser/autofill/form_structure.h b/chrome/browser/autofill/form_structure.h
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+++ b/chrome/browser/autofill/form_structure.h
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+// Copyright (c) 2009 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 CHROME_BROWSER_AUTOFILL_FORM_STRUCTURE_H_
+#define CHROME_BROWSER_AUTOFILL_FORM_STRUCTURE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/scoped_ptr.h"
+#include "chrome/browser/autofill/autofill_field.h"
+#include "googleurl/src/gurl.h"
+
+namespace webkit_glue {
+class FormFieldValues;
+}
+
+enum RequestMethod {
+  GET,
+  POST
+};
+
+// FormStructure stores a single HTML form together with the values entered
+// in the fields along with additional information needed by AutoFill.
+class FormStructure {
+ public:
+  explicit FormStructure(const webkit_glue::FormFieldValues& values);
+
+  // Encodes the XML upload request from this FormStructure.
+  bool EncodeUploadRequest(bool auto_fill_used, std::string* encoded_xml) const;
+
+  // The unique signature for this form, composed of the target url domain,
+  // the form name, and the form field names in a 64-bit hash.
+  std::string FormSignature() const;
+
+  // Runs a quick heuristic to rule out pages but obviously not auto-fillable,
+  // like google/yahoo/msn search, etc.
+  bool IsAutoFillable() const;
+
+ private:
+  // The name of the form.
+  std::string form_name_;
+
+  // The source URL.
+  GURL source_url_;
+
+  // The target URL.
+  GURL target_url_;
+
+  // A vector of all the input fields in the form.
+  std::vector<AutoFillField> fields_;
+
+  // The names of the form input elements, that are part of the form signature.
+  // The string starts with "&" and the names are also separated by the "&"
+  // character. E.g.: "&form_input1_name&form_input2_name&...&form_inputN_name"
+  std::string form_signature_field_names_;
+
+  // GET or POST.
+  RequestMethod method_;
+};
+
+#endif  // CHROME_BROWSER_AUTOFILL_FORM_STRUCTURE_H_