Upstream Chrome on iOS source code [6/11].

ios/chrome/browser/ui/qr_scanner/qr_scanner_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_UI_QR_SCANNER_QR_SCANNER_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_QR_SCANNER_QR_SCANNER_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+#include "ios/chrome/browser/ui/qr_scanner/camera_controller.h"
+
+@protocol QRScannerViewControllerDelegate
+
+// Called when the scanner detects a valid code. Camera recording is stopped
+// when a result is scanned and the QRScannerViewController is dismissed. This
+// function is called when the dismissal completes. A valid code is any
+// non-empty string. If |load| is YES, the scanned code was of a type which can
+// only encode digits, and the delegate can load the result immediately, instead
+// of prompting the user to confirm the result.
+- (void)receiveQRScannerResult:(NSString*)qrScannerResult
+               loadImmediately:(BOOL)load;
+
+@end
+
+@interface QRScannerViewController : UIViewController<CameraControllerDelegate>
+
+// The delegate which receives the scanned result after the view controller is
+// dismissed.
+@property(nonatomic, assign) id<QRScannerViewControllerDelegate> delegate;
+
+- (instancetype)initWithDelegate:(id<QRScannerViewControllerDelegate>)delegate
+    NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithNibName:(NSString*)name
+                         bundle:(NSBundle*)bundle NS_UNAVAILABLE;
+
+- (instancetype)initWithCoder:(NSCoder*)coder NS_UNAVAILABLE;
+
+// Returns a view controller to be presented based on the camera state. Returns
+// |self| if the camera is available or an appropriate UIAlertController if
+// there was an error loading the camera.
+- (UIViewController*)getViewControllerToPresent;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_QR_SCANNER_QR_SCANNER_VIEW_CONTROLLER_H_