1 files changed, 68 insertions, 0 deletions
diff --git a/docshell/base/BrowsingContextWebProgress.h b/docshell/base/BrowsingContextWebProgress.h
new file mode 100644
index 0000000000..8085da715b
--- /dev/null
+++ b/docshell/base/BrowsingContextWebProgress.h
@@ -0,0 +1,68 @@
+/* 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"
+
+namespace mozilla {
+namespace dom {
+
+class BrowsingContextWebProgress final : public nsIWebProgress,
+                                         public nsIWebProgressListener {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIWEBPROGRESS
+  NS_DECL_NSIWEBPROGRESSLISTENER
+
+  BrowsingContextWebProgress() = default;
+
+  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;
+  };
+
+ private:
+  virtual ~BrowsingContextWebProgress() = default;
+
+  void UpdateAndNotifyListeners(
+      uint32_t aFlag,
+      const std::function<void(nsIWebProgressListener*)>& aCallback);
+
+  using ListenerArray = nsAutoTObserverArray<ListenerInfo, 4>;
+  ListenerArray mListenerInfoList;
+
+  // This indicates whether we are currently suspending onStateChange top level
+  // STATE_START events for a document. We start suspending whenever we receive
+  // the first STATE_START event with the matching flags (see
+  // ::RecvOnStateChange for details), until we get a corresponding STATE_STOP
+  // event. In the meantime, if there other onStateChange events, this flag does
+  // not affect them. We do this to avoid duplicate onStateChange STATE_START
+  // events that happen during process switch. With this flag, we allow
+  // onStateChange STATE_START event from the old BrowserParent, but not the
+  // same event from the new BrowserParent during a process switch.
+  bool mSuspendOnStateStartChangeEvents = false;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_BrowsingContextWebProgress_h