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diff --git a/docshell/base/BrowsingContextWebProgress.h b/docshell/base/BrowsingContextWebProgress.h
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+/* 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/. */
+
+#ifndef mozilla_dom_BrowsingContextWebProgress_h
+#define mozilla_dom_BrowsingContextWebProgress_h
+
+#include "nsIWebProgress.h"
+#include "nsIWebProgressListener.h"
+#include "nsTObserverArray.h"
+#include "nsWeakReference.h"
+#include "nsCycleCollectionParticipant.h"
+#include "mozilla/BounceTrackingState.h"
+
+namespace mozilla::dom {
+
+class CanonicalBrowsingContext;
+
+/// Object acting as the nsIWebProgress instance for a BrowsingContext over its
+/// lifetime.
+///
+/// An active toplevel CanonicalBrowsingContext will always have a
+/// BrowsingContextWebProgress, which will be moved between contexts as
+/// BrowsingContextGroup-changing loads are performed.
+///
+/// Subframes will only have a `BrowsingContextWebProgress` if they are loaded
+/// in a content process, and will use the nsDocShell instead if they are loaded
+/// in the parent process, as parent process documents cannot have or be
+/// out-of-process iframes.
+class BrowsingContextWebProgress final : public nsIWebProgress,
+ public nsIWebProgressListener {
+ public:
+ NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+ NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(BrowsingContextWebProgress,
+ nsIWebProgress)
+ NS_DECL_NSIWEBPROGRESS
+ NS_DECL_NSIWEBPROGRESSLISTENER
+
+ explicit BrowsingContextWebProgress(
+ CanonicalBrowsingContext* aBrowsingContext);
+
+ struct ListenerInfo {
+ ListenerInfo(nsIWeakReference* aListener, unsigned long aNotifyMask)
+ : mWeakListener(aListener), mNotifyMask(aNotifyMask) {}
+
+ bool operator==(const ListenerInfo& aOther) const {
+ return mWeakListener == aOther.mWeakListener;
+ }
+ bool operator==(const nsWeakPtr& aOther) const {
+ return mWeakListener == aOther;
+ }
+
+ // Weak pointer for the nsIWebProgressListener...
+ nsWeakPtr mWeakListener;
+
+ // Mask indicating which notifications the listener wants to receive.
+ unsigned long mNotifyMask;
+ };
+
+ void ContextDiscarded();
+ void ContextReplaced(CanonicalBrowsingContext* aNewContext);
+
+ void SetLoadType(uint32_t aLoadType) { mLoadType = aLoadType; }
+
+ already_AddRefed<BounceTrackingState> GetBounceTrackingState();
+
+ private:
+ virtual ~BrowsingContextWebProgress();
+
+ void UpdateAndNotifyListeners(
+ uint32_t aFlag,
+ const std::function<void(nsIWebProgressListener*)>& aCallback);
+
+ using ListenerArray = nsAutoTObserverArray<ListenerInfo, 4>;
+ ListenerArray mListenerInfoList;
+
+ // The current BrowsingContext which owns this BrowsingContextWebProgress.
+ // This context may change during navigations and may not be fully attached at
+ // all times.
+ RefPtr<CanonicalBrowsingContext> mCurrentBrowsingContext;
+
+ // The current request being actively loaded by the BrowsingContext. Only set
+ // while mIsLoadingDocument is true, and is used to fire STATE_STOP
+ // notifications if the BrowsingContext is discarded while the load is
+ // ongoing.
+ nsCOMPtr<nsIRequest> mLoadingDocumentRequest;
+
+ // The most recent load type observed for this BrowsingContextWebProgress.
+ uint32_t mLoadType = 0;
+
+ // Are we currently in the process of loading a document? This is true between
+ // the `STATE_START` notification from content and the `STATE_STOP`
+ // notification being received. Duplicate `STATE_START` events may be
+ // discarded while loading a document to avoid noise caused by process
+ // switches.
+ bool mIsLoadingDocument = false;
+
+ RefPtr<mozilla::BounceTrackingState> mBounceTrackingState;
+};
+
+} // namespace mozilla::dom
+
+#endif // mozilla_dom_BrowsingContextWebProgress_h