Add password form search using blink::WebNode reference comparison.

components/autofill/content/renderer/provisionally_saved_password_form.h

Index: components/autofill/content/renderer/provisionally_saved_password_form.h
diff --git a/components/autofill/content/renderer/provisionally_saved_password_form.h b/components/autofill/content/renderer/provisionally_saved_password_form.h
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index 0000000000000000000000000000000000000000..318eb189aedac95a6e3a9b74f690af167715fd7a
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+++ b/components/autofill/content/renderer/provisionally_saved_password_form.h
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+// Copyright 2017 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_CONTENT_RENDERER_PROVISIONALLY_SAVED_PASSWORD_FORM_H_
+#define COMPONENTS_AUTOFILL_CONTENT_RENDERER_PROVISIONALLY_SAVED_PASSWORD_FORM_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "third_party/WebKit/public/web/WebInputElement.h"
+
+namespace autofill {
+
+struct PasswordForm;
+
+// Represents a possibly submitted password form.
+class ProvisionallySavedPasswordForm {
+ public:
+  ProvisionallySavedPasswordForm();
+  ~ProvisionallySavedPasswordForm();
+
+  // Sets the PasswordForm and web elements that were used in the PasswordForm
+  // update.
+  void Set(std::unique_ptr<PasswordForm> password_form,
+           const blink::WebFormElement& form_element,
+           const blink::WebInputElement& input_element);
+  void Reset();
+
+  // Returns true if the instance has |password_form_| set, but the actual
+  // password data may be invalid (e.g. empty username or password).
+  bool IsSet() const;
+  // Returns true if |password_form_| has enough information that it is likely
+  // filled out.
+  bool IsPasswordValid() const;
+
+  const PasswordForm& password_form() const {
+    DCHECK(IsSet());
+    return *password_form_;
+  }
+  const blink::WebFormElement& form_element() const { return form_element_; }
+  const blink::WebInputElement& input_element() const { return input_element_; }
+
+ private:
+  std::unique_ptr<PasswordForm> password_form_;
+  // Last used WebFormElement for the PasswordForm submission. Can be null if
+  // the form is unowned.
+  blink::WebFormElement form_element_;
+  // Last used WebInputElement which led to the PasswordForm update. Can be null
+  // if the user has performed a form submission (via a button, for example).
+  blink::WebInputElement input_element_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProvisionallySavedPasswordForm);
+};
+
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_PROVISIONALLY_SAVED_PASSWORD_FORM_H_