Make TracingImpl take a Shell* and args, instead of an ApplicationImpl*.

examples/echo/echo_benchmark.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 <stdio.h>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "examples/echo/echo.mojom.h"
@@ skipping 32 matching lines @@
  public:
   EchoClientDelegate()
       : warmup_(true),
         num_clients_(1),
         num_active_clients_(1),
         use_dart_server_(false),
         ending_(false),
         benchmark_duration_(base::TimeDelta::FromSeconds(10)) {}
 
   void Initialize(ApplicationImpl* app) override {
-    tracing_.Initialize(app);
+    tracing_.Initialize(app->shell(), &app->args());
 
     ParseArguments(app);
 
     for (int i = 0; i < num_clients_; i++) {
       EchoPtr echo;
       if (use_dart_server_) {
         ConnectToService(app->shell(), "mojo:dart_echo_server",
                          GetProxy(&echo));
       } else {
         ConnectToService(app->shell(), "mojo:echo_server", GetProxy(&echo));
@@ skipping 108 matching lines @@
 }
 
 }  // namespace examples
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(
       new mojo::examples::EchoClientDelegate);
   return runner.Run(application_request);
 }