media: Always enable trace event for "media" category group.

media/base/media.cc

 // Copyright 2013 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 "media/base/media.h"
 
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/path_service.h"
 #include "base/synchronization/lock.h"
+#include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "media/base/yuv_convert.h"
 
 #if !defined(MEDIA_DISABLE_FFMPEG)
 #include "media/ffmpeg/ffmpeg_common.h"
 #endif
 
 namespace media {
 
 // Media must only be initialized once, so use a LazyInstance to ensure this.
 class MediaInitializer {
  private:
   friend struct base::DefaultLazyInstanceTraits<MediaInitializer>;
 
   MediaInitializer() {
+    TRACE_EVENT_INIT_CATEGORY("media");
+
     // Perform initialization of libraries which require runtime CPU detection.
     InitializeCPUSpecificYUVConversions();
 
 #if !defined(MEDIA_DISABLE_FFMPEG)
     // Initialize CPU flags outside of the sandbox as this may query /proc for
     // details on the current CPU for NEON, VFP, etc optimizations.
     av_get_cpu_flags();
 
     // Disable logging as it interferes with layout tests.
     av_log_set_level(AV_LOG_QUIET);
@@ skipping 14 matching lines @@
 };
 
 static base::LazyInstance<MediaInitializer>::Leaky g_media_library =
     LAZY_INSTANCE_INITIALIZER;
 
 void InitializeMediaLibrary() {
   g_media_library.Get();
 }
 
 }  // namespace media