diff -r 000000000000 -r 6474c204b198 toolkit/components/startup/StartupTimeline.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/startup/StartupTimeline.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,67 @@
+/* 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/. */
+
+#include "StartupTimeline.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/TimeStamp.h"
+#include "nsXULAppAPI.h"
+
+namespace mozilla {
+
+TimeStamp StartupTimeline::sStartupTimeline[StartupTimeline::MAX_EVENT_ID];
+const char *StartupTimeline::sStartupTimelineDesc[StartupTimeline::MAX_EVENT_ID] = {
+#define mozilla_StartupTimeline_Event(ev, desc) desc,
+#include "StartupTimeline.h"
+#undef mozilla_StartupTimeline_Event
+};
+
+/**
+ * Implementation of XRE_StartupTimelineRecord()
+ *
+ * @param aEvent Same as XRE_StartupTimelineRecord() equivalent argument
+ * @param aWhen  Same as XRE_StartupTimelineRecord() equivalent argument
+ */
+void
+StartupTimelineRecordExternal(int aEvent, uint64_t aWhen)
+{
+#if XP_WIN
+  TimeStamp ts = TimeStampValue(aWhen, 0, 0);
+#else
+  TimeStamp ts = TimeStampValue(aWhen);
+#endif
+  bool error = false;
+
+  // Since the timestamp comes from an external source validate it before
+  // recording it and log a telemetry error if it appears inconsistent.
+  if (ts < TimeStamp::ProcessCreation(error)) {
+    Telemetry::Accumulate(Telemetry::STARTUP_MEASUREMENT_ERRORS,
+      (StartupTimeline::Event)aEvent);
+  } else {
+    StartupTimeline::Record((StartupTimeline::Event)aEvent, ts);
+  }
+}
+
+} /* namespace mozilla */
+
+/**
+ * The XRE_StartupTimeline_Record function is to be used by embedding
+ * applications that can't use mozilla::StartupTimeline::Record() directly.
+ *
+ * It can create timestamps from arbitrary time values and sanitizies them to
+ * ensure that they are not inconsistent with those captured using monotonic
+ * timers. The value of aWhen must have been captured using the same timer
+ * used by the platform's mozilla::TimeStamp implementation. Erroneous values
+ * will be flagged as telemetry errors.
+ *
+ * @param aEvent The event to be recorded, must correspond to an element of the
+ *               mozilla::StartupTimeline::Event enumartion
+ * @param aWhen  The time at which the event happened, must have been recorded
+ *               using the same timer as the platform's mozilla::TimeStamp
+ *               implementation
+ */
+void
+XRE_StartupTimelineRecord(int aEvent, PRTime aWhen)
+{
+  mozilla::StartupTimelineRecordExternal(aEvent, aWhen);
+}