Upstream Chrome on iOS source code [2/11].

ios/chrome/browser/payments/payment_request_manager.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_PAYMENTS_PAYMENT_REQUEST_MANAGER_H_
+#define IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_MANAGER_H_
+
+#import <UIKit/UIKit.h>
+
+namespace ios {
+class ChromeBrowserState;
+}
+
+namespace web {
+class WebState;
+}
+
+// Manager for handling invocations of the Payment Request API.
+//
+// Implements the app-side of the Payment Request JavaScript API. Injects and
+// listens to the injected JavaScript and invokes the creation of the user
+// interface.
+@interface PaymentRequestManager : NSObject
+
+// YES if Payment Request is enabled on the current web state.
+@property(readonly) BOOL enabled;
+
+// The current web state being observed for PaymentRequest invocations.
+@property(nonatomic, assign) web::WebState* webState;
+
+// Designated initializer.
+- (instancetype)initWithBaseViewController:(UIViewController*)viewController
+                              browserState:
+                                  (ios::ChromeBrowserState*)browserState
+    NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+// Sets the WebState to be observed for invocations of the Payment Request API.
+// |webState|'s lifetime should be greater than the reciever's. |webState| can
+// be nil.
+- (void)setWebState:(web::WebState*)webState;
+
+// Enables or disables the Payment Request API for the current webState. If
+// |enabled| is YES, the API may still not be enabled if the flag is not set;
+// the -enabled property will indicate the current status. This method functions
+// asynchronously.
+- (void)enablePaymentRequest:(BOOL)enabled;
+
+// Cancels the pending request and dismiss the UI.
+- (void)cancelRequest;
+
+// Destroys the receiver. Any following call is not supported.
+- (void)close;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_MANAGER_H_