Plumb Push API permission request through Blink using Frame.

Source/modules/push_messaging/PushManager.h

Index: Source/modules/push_messaging/PushManager.h
diff --git a/Source/modules/push_messaging/PushManager.h b/Source/modules/push_messaging/PushManager.h
index 7596e71292ccfa29430bd3cb424f93fee901b27a..0851d796fd6ca140b75f6a39b8630446ac271693 100644
--- a/Source/modules/push_messaging/PushManager.h
+++ b/Source/modules/push_messaging/PushManager.h
@@ -7,11 +7,15 @@
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
+#include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class ScriptPromise;
 class ScriptState;
+class ScriptPromiseResolver;
+class WebPushClient;
+class WebServiceWorkerProvider;
 
 class PushManager final : public GarbageCollected<PushManager>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
@@ -24,6 +28,8 @@ public:
     ScriptPromise registerPushMessaging(ScriptState*);
     ScriptPromise hasPermission(ScriptState*);
 
+    void doRegister(WebPushClient*, PassRefPtr<ScriptPromiseResolver>, WebServiceWorkerProvider*);
+
     void trace(Visitor*) { }
 
 private: