Add tracing AutoOpenCloseEvent.

base/trace_event/video_playback_pae.cc

Index: base/trace_event/video_playback_pae.cc
diff --git a/base/trace_event/video_playback_pae.cc b/base/trace_event/video_playback_pae.cc
new file mode 100644
index 0000000000000000000000000000000000000000..dcc0f4af1a81323e6c7d919b20cb56e30fbf4847
--- /dev/null
+++ b/base/trace_event/video_playback_pae.cc
@@ -0,0 +1,35 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/trace_event/video_playback_pae.h"
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
+
+namespace base {
+
+namespace trace_event {
+
+VideoPlaybackPersistentAsyncEvent::VideoPlaybackPersistentAsyncEvent()
+    : PersistentAsyncEvent() {}
+
+VideoPlaybackPersistentAsyncEvent::~VideoPlaybackPersistentAsyncEvent() {}
+
+void VideoPlaybackPersistentAsyncEvent::RecordBeginEvent() {
+  TRACE_EVENT_ASYNC_BEGIN0("media,rail", "VideoPlayback", id());
+}
+
+void VideoPlaybackPersistentAsyncEvent::RecordBeginEventWithTimestamp(
+    base::TimeTicks timestamp) {
+  TRACE_EVENT_ASYNC_BEGIN_WITH_TIMESTAMP0("media,rail", "VideoPlayback", id(),
+                                          timestamp.ToInternalValue());
+}
+
+void VideoPlaybackPersistentAsyncEvent::RecordEndEvent() {
+  TRACE_EVENT_ASYNC_END0("media,rail", "VideoPlayback", id());
+}
+
+}  // namespace trace_event
+}  // namespace base