Blink implementation of PushManager#hasPermission()

Source/modules/push_messaging/PushPermissionCallback.h

Index: Source/modules/push_messaging/PushPermissionCallback.h
diff --git a/Source/modules/push_messaging/PushPermissionCallback.h b/Source/modules/push_messaging/PushPermissionCallback.h
new file mode 100644
index 0000000000000000000000000000000000000000..6daf69ea830f27d34923b96edfe26581e9500293
--- /dev/null
+++ b/Source/modules/push_messaging/PushPermissionCallback.h
@@ -0,0 +1,42 @@
+// 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 PushPermissionCallback_h
+#define PushPermissionCallback_h
+
+#include "public/platform/WebPushClient.h"
+#include "public/platform/WebPushPermissionStatus.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace WTF {
+class String;
+}
+
+namespace blink {
+
+class ScriptPromiseResolver;
+
+// Will resolve the underlying promise depending on the permission passed to the callback.
+class PushPermissionCallback final : public WebPushPermissionCallback {
+    WTF_MAKE_NONCOPYABLE(PushPermissionCallback);
+
+public:
+    explicit PushPermissionCallback(PassRefPtr<ScriptPromiseResolver>);
+    virtual ~PushPermissionCallback();
+
+    void onSuccess(WebPushPermissionStatus*) override;
+
+    // Called if for some reason the status of the push permission cannot be checked.
+    void onError() override;
+
+private:
+    static const WTF::String& permissionString(WebPushPermissionStatus);
+    RefPtr<ScriptPromiseResolver> m_resolver;
+};
+
+} // namespace blink
+
+#endif // PushPermissionCallback_h