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..80af96b24065bee26c5ca0e2298efb9314fa2b78
--- /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"

[benjhayden, 2016/08/30 04:17:24]

Is this include still needed?

[alexandermont, 2016/08/30 19:01:22]

Removed

+#include "base/trace_event/trace_event.h"

[benjhayden, 2016/08/30 04:17:23]

Is this include still needed?

[alexandermont, 2016/08/30 19:01:22]

This is still needed because TRACE_EVENT... macros are in this header file. But
base/macros.h is not.

+
+namespace base {
+
+namespace trace_event {
+
+VideoPlaybackPersistentAsyncEvent::VideoPlaybackPersistentAsyncEvent()
+    : PersistentAsyncEvent() {}
+
+VideoPlaybackPersistentAsyncEvent::~VideoPlaybackPersistentAsyncEvent() {}
+
+void VideoPlaybackPersistentAsyncEvent::RecordStartEvent() {
+  TRACE_EVENT_ASYNC_BEGIN0("media,rail", "VideoPlayback", id_);
+}
+
+void VideoPlaybackPersistentAsyncEvent::RecordStartEventWithTimestamp(
+    int64_t timestamp) {
+  TRACE_EVENT_ASYNC_BEGIN_WITH_TIMESTAMP0("media,rail", "VideoPlayback", id_,
+                                          timestamp);
+}
+
+void VideoPlaybackPersistentAsyncEvent::RecordStopEvent() {
+  TRACE_EVENT_ASYNC_END0("media,rail", "VideoPlayback", id_);
+}
+
+}  // namespace trace_event
+}  // namespace base