Add InfoBarPickerController for displaying a picker view from an infobar

ios/chrome/browser/infobars/infobar_picker_view_controller.h

+// Copyright 2016 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 IOS_CHROME_BROWSER_INFOBARS_INFOBAR_PICKER_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_INFOBARS_INFOBAR_PICKER_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+@class InfoBarPickerViewController;
+
+// Delegate protocol for InfoBarPickerViewController.
+@protocol InfoBarPickerViewControllerDelegate<NSObject>
+// Returns text for |row| in the picker.
+- (NSString*)infoBarPickerViewController:
+                 (InfoBarPickerViewController*)controller
+                              textForRow:(NSInteger)row;
+// Returns the number of rows in the picker.
+- (NSInteger)infoBarPickerViewControllerNumberOfRows:
+    (InfoBarPickerViewController*)controller;
+// Returns the index of the row to be initially selected in the picker.
+- (NSInteger)infoBarPickerViewControllerInitialRow:
+    (InfoBarPickerViewController*)controller;
+@optional
+// If implemented, returns the index of the row to be disabled in the picker.
+- (NSInteger)infoBarPickerViewControllerDisabledRow:
+    (InfoBarPickerViewController*)controller;
+@end
+
+// View controller for displaying a UIPickerView topped by a UINavigationBar
+// displaying "Done" on the right and "Cancel" on the left.
+@interface InfoBarPickerViewController : UIViewController
+// The picker view displayed by the InfoBarPickerViewController.
+@property(nonatomic, retain) UIPickerView* pickerView;
+@property(nonatomic, weak) id<InfoBarPickerViewControllerDelegate> delegate;
+// Sets target and action for the "Done" button.
+- (void)setDoneTarget:(id)target action:(SEL)action;
+// Sets target and action for the "Cancel" button.
+- (void)setCancelTarget:(id)target action:(SEL)action;
+@end
+
+@interface InfoBarPickerViewController ()
+// The displayed UINavigationBar. Exposed for testing.
+@property(nonatomic, retain) UINavigationBar* navigationBar;
+@end
+
+#endif  // IOS_CHROME_BROWSER_INFOBARS_INFOBAR_PICKER_VIEW_CONTROLLER_H_