1 files changed, 32 insertions, 0 deletions
diff --git a/tools/profiler/gecko/ProfilerIOInterposeObserver.h b/tools/profiler/gecko/ProfilerIOInterposeObserver.h
new file mode 100644
index 0000000000..9e22a34f15
--- /dev/null
+++ b/tools/profiler/gecko/ProfilerIOInterposeObserver.h
@@ -0,0 +1,32 @@
+/* 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 PROFILERIOINTERPOSEOBSERVER_H
+#define PROFILERIOINTERPOSEOBSERVER_H
+
+#include "mozilla/IOInterposer.h"
+#include "nsISupportsImpl.h"
+
+namespace mozilla {
+
+/**
+ * This class is the observer that calls into the profiler whenever
+ * main thread I/O occurs.
+ */
+class ProfilerIOInterposeObserver final : public IOInterposeObserver {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ProfilerIOInterposeObserver)
+
+ public:
+  static ProfilerIOInterposeObserver& GetInstance();
+
+  virtual void Observe(Observation& aObservation) override;
+
+ private:
+  ProfilerIOInterposeObserver() = default;
+  virtual ~ProfilerIOInterposeObserver() {}
+};
+
+}  // namespace mozilla
+
+#endif  // PROFILERIOINTERPOSEOBSERVER_H