mandoline: write this after lunch.

components/filesystem/file_system_app.cc

 // Copyright 2015 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 "components/filesystem/file_system_app.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/application/public/cpp/application_impl.h"
 
 namespace filesystem {
 
 FileSystemApp::FileSystemApp() : app_(nullptr), in_shutdown_(false) {}
 
 FileSystemApp::~FileSystemApp() {}
 
 void FileSystemApp::Initialize(mojo::ApplicationImpl* app) {
   app_ = app;
+  tracing_.Initialize(app);
 }
 
 bool FileSystemApp::ConfigureIncomingConnection(
     mojo::ApplicationConnection* connection) {
   connection->AddService<FileSystem>(this);
   return true;
 }
 
 void FileSystemApp::RegisterDirectoryToClient(DirectoryImpl* directory,
                                               FileSystemClientPtr client) {
@@ skipping 59 matching lines @@
 FileSystemApp::Client::~Client() {}
 
 FileSystemApp::Client& FileSystemApp::Client::operator=(
     FileSystemApp::Client&& rhs) {
   directory_ = rhs.directory_;
   fs_client_ = rhs.fs_client_.Pass();
   return *this;
 }
 
 }  // namespace filesystem