PaymentHandler: Implement requestPermission().

third_party/WebKit/Source/modules/payments/PaymentManager.h

Index: third_party/WebKit/Source/modules/payments/PaymentManager.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentManager.h b/third_party/WebKit/Source/modules/payments/PaymentManager.h
index 1b32bb3cb819445273022e90d1478374f9e1e4fd..0d79e15a7e6028461f82858b29b5fbef97989679 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentManager.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentManager.h
@@ -10,10 +10,12 @@
 #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
@@ -26,6 +28,7 @@ class MODULES_EXPORT PaymentManager final
   static PaymentManager* Create(ServiceWorkerRegistration*);
 
   PaymentInstruments* instruments();
+  ScriptPromise requestPermission(ScriptState*);
 
   DECLARE_TRACE();
 
@@ -34,8 +37,14 @@ class MODULES_EXPORT PaymentManager final
 
   void OnServiceConnectionError();
 
+  // For PaymentManager service
+  void OnPermissionRequestComplete(ScriptPromiseResolver*,
+                                   mojom::blink::PermissionStatus);
+  void OnPermissionServiceConnectionError();
+
   Member<ServiceWorkerRegistration> registration_;
   payments::mojom::blink::PaymentManagerPtr manager_;
+  mojom::blink::PermissionServicePtr permission_service_;
   Member<PaymentInstruments> instruments_;
 };