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

examples/echo/echo_benchmark.cc

Index: examples/echo/echo_benchmark.cc
diff --git a/examples/echo/echo_benchmark.cc b/examples/echo/echo_benchmark.cc
index e8da193532a091250c79d37e6c9af50fba83248b..30e804488ebe26e5a74f463719b0cbb6045e245c 100644
--- a/examples/echo/echo_benchmark.cc
+++ b/examples/echo/echo_benchmark.cc
@@ -50,7 +50,7 @@ class EchoClientDelegate : public ApplicationDelegate {
         benchmark_duration_(base::TimeDelta::FromSeconds(10)) {}
 
   void Initialize(ApplicationImpl* app) override {
-    tracing_.Initialize(app);
+    tracing_.Initialize(app->shell(), &app->args());
 
     ParseArguments(app);