1 files changed, 31 insertions, 0 deletions
diff --git a/docshell/base/timeline/CompositeTimelineMarker.h b/docshell/base/timeline/CompositeTimelineMarker.h
new file mode 100644
index 0000000000..cd2896fefa
--- /dev/null
+++ b/docshell/base/timeline/CompositeTimelineMarker.h
@@ -0,0 +1,31 @@
+/* -*- 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_CompositeTimelineMarker_h_
+#define mozilla_CompositeTimelineMarker_h_
+
+#include "TimelineMarker.h"
+#include "mozilla/dom/ProfileTimelineMarkerBinding.h"
+
+namespace mozilla {
+
+class CompositeTimelineMarker : public TimelineMarker {
+ public:
+  CompositeTimelineMarker(const TimeStamp& aTime,
+                          MarkerTracingType aTracingType)
+      : TimelineMarker("Composite", aTime, aTracingType) {
+    // Even though these markers end up being created on the main thread in the
+    // content or chrome processes, they actually trace down code in the
+    // compositor parent process. All the information for creating these markers
+    // is sent along via IPC to an nsView when a composite finishes.
+    // Mark this as 'off the main thread' to style it differently in frontends.
+    SetOffMainThread(true);
+  }
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_CompositeTimelineMarker_h_