1 files changed, 49 insertions, 0 deletions
diff --git a/docshell/base/timeline/TimelineMarker.h b/docshell/base/timeline/TimelineMarker.h
new file mode 100644
index 000000000..2e0b4dd02
--- /dev/null
+++ b/docshell/base/timeline/TimelineMarker.h
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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_TimelineMarker_h_
+#define mozilla_TimelineMarker_h_
+
+#include "AbstractTimelineMarker.h"
+#include "js/RootingAPI.h"
+
+namespace mozilla {
+
+// Objects of this type can be added to the timeline if there is an interested
+// consumer. The class can also be subclassed to let a given marker creator
+// provide custom details.
+class TimelineMarker : public AbstractTimelineMarker
+{
+public:
+  TimelineMarker(const char* aName,
+                 MarkerTracingType aTracingType,
+                 MarkerStackRequest aStackRequest = MarkerStackRequest::STACK);
+
+  TimelineMarker(const char* aName,
+                 const TimeStamp& aTime,
+                 MarkerTracingType aTracingType,
+                 MarkerStackRequest aStackRequest = MarkerStackRequest::STACK);
+
+  virtual void AddDetails(JSContext* aCx, dom::ProfileTimelineMarker& aMarker) override;
+  virtual JSObject* GetStack() override;
+
+protected:
+  void CaptureStack();
+
+private:
+  // While normally it is not a good idea to make a persistent root,
+  // in this case changing nsDocShell to participate in cycle
+  // collection was deemed too invasive, and the markers are only held
+  // here temporarily to boot.
+  JS::PersistentRooted<JSObject*> mStackTrace;
+
+  void CaptureStackIfNecessary(MarkerTracingType aTracingType,
+                               MarkerStackRequest aStackRequest);
+};
+
+} // namespace mozilla
+
+#endif /* mozilla_TimelineMarker_h_ */