1 files changed, 51 insertions, 0 deletions
diff --git a/docshell/base/timeline/AutoTimelineMarker.cpp b/docshell/base/timeline/AutoTimelineMarker.cpp
new file mode 100644
index 000000000..dbf4bd596
--- /dev/null
+++ b/docshell/base/timeline/AutoTimelineMarker.cpp
@@ -0,0 +1,51 @@
+/* -*- 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/. */
+
+#include "AutoTimelineMarker.h"
+
+#include "TimelineConsumers.h"
+#include "MainThreadUtils.h"
+
+namespace mozilla {
+
+AutoTimelineMarker::AutoTimelineMarker(nsIDocShell* aDocShell, const char* aName
+                                       MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
+  : mName(aName)
+  , mDocShell(nullptr)
+{
+  MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!aDocShell) {
+    return;
+  }
+
+  RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
+  if (!timelines || !timelines->HasConsumer(aDocShell)) {
+    return;
+  }
+
+  mDocShell = aDocShell;
+  timelines->AddMarkerForDocShell(mDocShell, mName, MarkerTracingType::START);
+}
+
+AutoTimelineMarker::~AutoTimelineMarker()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!mDocShell) {
+    return;
+  }
+
+  RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
+  if (!timelines || !timelines->HasConsumer(mDocShell)) {
+    return;
+  }
+
+  timelines->AddMarkerForDocShell(mDocShell, mName, MarkerTracingType::END);
+}
+
+} // namespace mozilla