Plumb Push API permission request through Blink using Frame.

Source/modules/push_messaging/PushPermissionRequestCallback.h

+// Copyright 2014 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 PushPermissionRequestCallback_h
+#define PushPermissionRequestCallback_h
+
+#include "platform/heap/Handle.h"
+#include "public/platform/WebCallback.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+
+class PushManager;
+class ScriptPromiseResolver;
+class WebPushClient;
+class WebServiceWorkerProvider;
+
+class PushPermissionRequestCallback final : public WebCallback {
+    WTF_MAKE_NONCOPYABLE(PushPermissionRequestCallback);
+
+public:
+    // Since |PushManager| is oilpan garbage collected this will keep it alive.
+    // Does not take ownership of |WebPushClient|.
+    // Since |ScriptPromiseResolver| is ref counted this will keep it alive.
+    // Does not take ownership of |WebServiceWorkerProvider|.
+    PushPermissionRequestCallback(PushManager*, WebPushClient*, PassRefPtr<ScriptPromiseResolver>, WebServiceWorkerProvider*);
+    ~PushPermissionRequestCallback() override;
+
+    void run() override;
+
+private:
+    Persistent<PushManager> m_manager;
+    WebPushClient* m_client;
+    RefPtr<ScriptPromiseResolver> m_resolver;
+    WebServiceWorkerProvider* m_serviceWorkerProvider;
+};
+
+} // namespace blink
+
+#endif // PushPermissionRequestCallback_h