Add a trace for WebRTC initialization time

third_party/libjingle/overrides/init_webrtc.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 "init_webrtc.h"
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/files/file_path.h"
 #include "base/native_library.h"
@@ skipping 53 matching lines @@
 #elif defined(OS_ANDROID)
   path = path.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
 #else
   path = path.Append(FILE_PATH_LITERAL("lib"))
              .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
 #endif
   return path;
 }
 
 bool InitializeWebRtcModule() {
+  TRACE_EVENT0("webrtc", "InitializeWebRtcModule");
+
   if (g_create_webrtc_media_engine)
     return true;  // InitializeWebRtcModule has already been called.
 
   base::FilePath path(GetLibPeerConnectionPath());
   DVLOG(1) << "Loading WebRTC module: " << path.value();
 
   std::string error;
   static base::NativeLibrary lib =
       base::LoadNativeLibrary(path, &error);
   CHECK(lib) << error;
@@ skipping 30 matching lines @@
   InitializeWebRtcModule();
   return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
       decoder_factory);
 }
 
 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
   g_destroy_webrtc_media_engine(media_engine);
 }
 
 #endif  // LIBPEERCONNECTION_LIB