Enable compilation of //components/autofill on iOS with gn.

components/autofill/ios/browser/keyboard_accessory_metrics_logger.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_IOS_BROWSER_KEYBOARD_ACCESSORY_METRICS_LOGGER_H_
-#define COMPONENTS_AUTOFILL_IOS_BROWSER_KEYBOARD_ACCESSORY_METRICS_LOGGER_H_
-
-#include "base/basictypes.h"
-
-namespace autofill {
-
-class KeyboardAccessoryMetricsLogger {
- public:
-  // Each of these metrics is logged only for potentially autofillable forms,
-  // i.e. forms with at least three fields, etc.
-  // These are used to derive how often the keyboard accessory buttons are used.
-  // For example, (NEXT_BUTTON_PRESSED_ONCE / SUBMITTED_FORM) gives the fraction
-  // of submitted forms where the user pressed the "next field" keyboard
-  // accessory button to navigate the form.
-  enum ButtonMetric {
-    // Loaded a page containing forms.
-    // Should be logged under exact same conditions as
-    // UserHappinessMetric.FORMS_LOADED to make this data as directly
-    // comparable as possible with UserHappinessMetric.
-    FORMS_LOADED = 0,
-    // Submitted a form.
-    // Should be logged under same conditions as UserHappiness.SUBMITTED_*, for
-    // same reason as FORMS_LOADED above.
-    SUBMITTED_FORM,
-    // User pressed the "Close" button on the keyboard accessory.
-    CLOSE_BUTTON_PRESSED,
-    // Same as above, but only logged once per page load.
-    CLOSE_BUTTON_PRESSED_ONCE,
-    // User pressed the "Next" button on the keyboard accessory.
-    NEXT_BUTTON_PRESSED,
-    // Same as above, but only logged once per page load.
-    NEXT_BUTTON_PRESSED_ONCE,
-    // User pressed the "Previous" button on the keyboard accessory.
-    PREVIOUS_BUTTON_PRESSED,
-    // Same as above, but only logged once per page load.
-    PREVIOUS_BUTTON_PRESSED_ONCE,
-    NUM_BUTTON_METRICS,
-  };
-
-  KeyboardAccessoryMetricsLogger();
-
-  // Called when a page with potentially autofillable forms is loaded,
-  // i.e. forms with at least three fields, etc.
-  static void OnFormsLoaded();
-
-  // Called when a potentially autofillable form is submitted.
-  static void OnFormSubmitted();
-
-  // Called when the user presses the "close keyboard" keyboard accessory
-  // button.
-  void OnCloseButtonPressed();
-
-  // Called when the user presses the "next field" keyboard accessory button.
-  void OnNextButtonPressed();
-
-  // Called when the user presses the "previous field" keyboard accessory
-  // button.
-  void OnPreviousButtonPressed();
-
- private:
-  bool has_logged_close_button_;
-  bool has_logged_next_button_;
-  bool has_logged_previous_button_;
-};
-
-}  // namespace autofill
-
-#endif  // COMPONENTS_AUTOFILL_IOS_BROWSER_KEYBOARD_ACCESSORY_METRICS_LOGGER_H_