Add InfoBarPickerController for displaying a picker view from an infobar

ios/chrome/browser/infobars/infobar_picker_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_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_INFOBARS_INFOBAR_PICKER_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+@class InfoBarPickerController;
+
+// Delegate protocol for InfoBarPickerController.
+@protocol InfoBarPickerControllerDelegate<NSObject>
+// Returns text for |row| in the picker.
+- (NSString*)infoBarPickerController:(InfoBarPickerController*)controller
+                          textForRow:(NSInteger)row;
+// Returns the number of rows in the picker.
+- (NSInteger)infoBarPickerControllerNumberOfRows:
+    (InfoBarPickerController*)controller;
+// Returns the index of the row to be initially selected in the picker.
+- (NSInteger)infoBarPickerControllerInitialRow:
+    (InfoBarPickerController*)controller;
+@optional
+// If implemented, returns the index of the row to be disabled in the picker.
+- (NSInteger)infoBarPickerControllerDisabledRow:
+    (InfoBarPickerController*)controller;
+@end
+
+// View controller for displaying a UIPickerView topped by a UINavigationBar
+// displaying "Done" on the right and "Cancel" on the left.
+@interface InfoBarPickerController : UIViewController

[marq (ping after 24h), 2016/06/30 16:10:11]

Please name view controller subclasses "<something>ViewController".

[Jackie Quinn, 2016/06/30 18:00:39]

Done.

+// The picker view displayed by the InfoBarPickerController.
+@property(nonatomic, retain) UIPickerView* pickerView;
+@property(nonatomic, weak) id<InfoBarPickerControllerDelegate> 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 InfoBarPickerController ()
+// The displayed UINavigationBar. Exposed for testing.
+@property(nonatomic, retain) UINavigationBar* navigationBar;
+@end
+
+#endif  // IOS_CHROME_BROWSER_INFOBARS_INFOBAR_PICKER_CONTROLLER_H_