PaymentHandler: Implement requestPermission().

third_party/WebKit/Source/modules/payments/PaymentManager.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 PaymentManager_h
 #define PaymentManager_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "modules/ModulesExport.h"
 #include "platform/bindings/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/payments/payment_app.mojom-blink.h"
+#include "public/platform/modules/permissions/permission.mojom-blink.h"
 
 namespace blink {
 
 class PaymentInstruments;
+class ScriptPromiseResolver;
 class ServiceWorkerRegistration;
 
 class MODULES_EXPORT PaymentManager final
     : public GarbageCollectedFinalized<PaymentManager>,
       public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
   WTF_MAKE_NONCOPYABLE(PaymentManager);
 
  public:
   static PaymentManager* Create(ServiceWorkerRegistration*);
 
   PaymentInstruments* instruments();
+  ScriptPromise requestPermission(ScriptState*);
 
   DECLARE_TRACE();
 
  private:
   explicit PaymentManager(ServiceWorkerRegistration*);
 
+  // For PaymentManager service

[please use gerrit instead, 2017/06/20 13:28:09]

Should this comment be for the next method?

[zino, 2017/06/22 17:26:47]

Done.

   void OnServiceConnectionError();
 
+  void OnPermissionRequestComplete(ScriptPromiseResolver*,
+                                   mojom::blink::PermissionStatus);
+  void OnPermissionServiceConnectionError();
+
   Member<ServiceWorkerRegistration> registration_;
   payments::mojom::blink::PaymentManagerPtr manager_;
+  mojom::blink::PermissionServicePtr permission_service_;
   Member<PaymentInstruments> instruments_;
 };
 
 }  // namespace blink
 
 #endif  // PaymentManager_h