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

components/autofill/content/renderer/provisionally_saved_form.h

Index: components/autofill/content/renderer/provisionally_saved_form.h
diff --git a/components/autofill/content/renderer/provisionally_saved_form.h b/components/autofill/content/renderer/provisionally_saved_form.h
new file mode 100644
index 0000000000000000000000000000000000000000..623e629832d4514743a8b0fd1f1fe925067ff2cd
--- /dev/null
+++ b/components/autofill/content/renderer/provisionally_saved_form.h
@@ -0,0 +1,60 @@
+// 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_FORM_H_
+#define COMPONENTS_AUTOFILL_CONTENT_RENDERER_PROVISIONALLY_SAVED_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 ProvisionallySavedForm {
+ public:
+  ProvisionallySavedForm();
+  ~ProvisionallySavedForm();
+
+  // 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);
+  // Resets the instance.
+  void Reset();

[dvadym, 2017/03/14 17:11:11]

Nit: comment is trivial, just remove it.

[sense (YandexTeam), 2017/03/15 04:51:24]

Done.

+
+  // 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;
+
+  // Returns the set PasswordForm.
+  const PasswordForm& password_form() const {

[dvadym, 2017/03/14 17:11:11]

Nit: comment is trivial, just remove it.

+    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(ProvisionallySavedForm);
+};
+
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_PROVISIONALLY_SAVED_FORM_H_