Teach the mojo_shell --trace-startup flag to gather data from services

shell/android/main.cc

Index: shell/android/main.cc
diff --git a/shell/android/main.cc b/shell/android/main.cc
index 99bdf82640d96191d7f4e6f1b6b831016888e656..ac72bcb8eb52a03dfdc588d2f357a8c71bfd3beb 100644
--- a/shell/android/main.cc
+++ b/shell/android/main.cc
@@ -221,7 +221,7 @@ static void Init(JNIEnv* env,
   // We want ~MessageLoop to happen prior to ~Context. Initializing
   // LazyInstances is akin to stack-allocating objects; their destructors
   // will be invoked first-in-last-out.
-  Context* shell_context = new Context();
+  Context* shell_context = new Context(tracer);
   shell_context->SetShellFileRoot(base::FilePath(
       base::android::ConvertJavaStringToUTF8(env, j_local_apps_directory)));
   g_internal_data.Get().context.reset(shell_context);