Prepare the infrastructure for password overrides.

components/autofill/core/common/password_form_field_prediction_map.h

Index: components/autofill/core/common/password_form_field_prediction_map.h
diff --git a/components/autofill/core/common/password_form_field_prediction_map.h b/components/autofill/core/common/password_form_field_prediction_map.h
new file mode 100644
index 0000000000000000000000000000000000000000..9c22fbeb0bc18153b921c272b7595a49c4738e41
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+++ b/components/autofill/core/common/password_form_field_prediction_map.h
@@ -0,0 +1,30 @@
+// 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_BROWSER_PASSWORD_FORM_FIELD_PREDICTION_MAP_H_
+#define COMPONENTS_AUTOFILL_CORE_BROWSER_PASSWORD_FORM_FIELD_PREDICTION_MAP_H_
+
+#include <map>
+
+#include "components/autofill/core/common/form_field_data.h"
+
+namespace autofill {
+
+// This enum lists form field types as understood by the password manager,
+// esentially a digest of |autofill::ServerFieldType|. Note that we cannot
+// simply reuse |autofill::ServerFieldType| as it is defined in the browser,
+// while this enum will be used by both the browser and renderer.
+enum PasswordFormFieldPredictionType {
+  PREDICTION_USERNAME,
+  PREDICTION_CURRENT_PASSWORD,
+  PREDICTION_NEW_PASSWORD,
+  PREDICTION_MAX = PREDICTION_NEW_PASSWORD
+};
+
+using PasswordFormFieldPredictionMap =
+    std::map<PasswordFormFieldPredictionType, FormFieldData>;
+
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_PASSWORD_FORM_FIELD_PREDICTION_MAP_H_