1 files changed, 51 insertions, 0 deletions
diff --git a/dom/media/BackgroundVideoDecodingPermissionObserver.h b/dom/media/BackgroundVideoDecodingPermissionObserver.h
new file mode 100644
index 0000000000..ee8e8164de
--- /dev/null
+++ b/dom/media/BackgroundVideoDecodingPermissionObserver.h
@@ -0,0 +1,51 @@
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if !defined(BackgroundVideoDecodingPermissionObserver_h_)
+#  define BackgroundVideoDecodingPermissionObserver_h_
+
+#  include "nsIObserver.h"
+#  include "nsISupportsImpl.h"
+
+class nsISupports;
+class nsPIDOMWindowOuter;
+
+namespace mozilla {
+
+namespace dom {
+class Document;
+class BrowsingContext;
+}  // namespace dom
+
+class MediaDecoder;
+
+class BackgroundVideoDecodingPermissionObserver final : public nsIObserver {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit BackgroundVideoDecodingPermissionObserver(MediaDecoder* aDecoder);
+
+  NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
+                     const char16_t* aData) override;
+  void RegisterEvent();
+  void UnregisterEvent();
+
+ private:
+  ~BackgroundVideoDecodingPermissionObserver();
+  void EnableEvent() const;
+  void DisableEvent() const;
+  dom::BrowsingContext* GetOwnerBC() const;
+  dom::Document* GetOwnerDoc() const;
+  bool IsValidEventSender(nsISupports* aSubject) const;
+
+  // The life cycle of observer would always be shorter than decoder, so we
+  // use raw pointer here.
+  MediaDecoder* mDecoder;
+  bool mIsRegisteredForEvent;
+};
+
+}  // namespace mozilla
+
+#endif  // BackgroundVideoDecodingPermissionObserver_h_