diff -r 000000000000 -r 6474c204b198 tools/profiler/GeckoTaskTracer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/profiler/GeckoTaskTracer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 GECKO_TASK_TRACER_H
+#define GECKO_TASK_TRACER_H
+
+#include "nsCOMPtr.h"
+
+/**
+ * TaskTracer provides a way to trace the correlation between different tasks
+ * across threads and processes. Unlike sampling based profilers, TaskTracer can
+ * tell you where a task is dispatched from, what its original source was, how
+ * long it waited in the event queue, and how long it took to execute.
+ *
+ * Source Events are usually some kinds of I/O events we're interested in, such
+ * as touch events, timer events, network events, etc. When a source event is
+ * created, TaskTracer records the entire chain of Tasks and nsRunnables as they
+ * are dispatched to different threads and processes. It records latency,
+ * execution time, etc. for each Task and nsRunnable that chains back to the
+ * original source event.
+ */
+
+class Task;
+class nsIRunnable;
+
+namespace mozilla {
+namespace tasktracer {
+
+class FakeTracedTask;
+
+enum SourceEventType {
+  UNKNOWN = 0,
+  TOUCH,
+  MOUSE,
+  KEY,
+  BLUETOOTH,
+  UNIXSOCKET,
+  WIFI
+};
+
+class AutoSourceEvent
+{
+public:
+  AutoSourceEvent(SourceEventType aType);
+  ~AutoSourceEvent();
+};
+
+// Add a label to the currently running task, aFormat is the message to log,
+// followed by corresponding parameters.
+void AddLabel(const char* aFormat, ...);
+
+/**
+ * Internal functions.
+ */
+
+Task* CreateTracedTask(Task* aTask);
+
+already_AddRefed<nsIRunnable> CreateTracedRunnable(nsIRunnable* aRunnable);
+
+FakeTracedTask* CreateFakeTracedTask(int* aVptr);
+
+// Free the TraceInfo allocated on a thread's TLS. Currently we are wrapping
+// tasks running on nsThreads and base::thread, so FreeTraceInfo is called at
+// where nsThread and base::thread release themselves.
+void FreeTraceInfo();
+
+} // namespace tasktracer
+} // namespace mozilla.
+
+#endif