Only enable the Dart timeline for benchmarks

services/tracing/tracing_app.cc

Index: services/tracing/tracing_app.cc
diff --git a/services/tracing/tracing_app.cc b/services/tracing/tracing_app.cc
index 62cec7017db3240cae09deb5ffe3e03eb823cac1..93b12b06934a4342f1964010d2caf50309f3265a 100644
--- a/services/tracing/tracing_app.cc
+++ b/services/tracing/tracing_app.cc
@@ -81,7 +81,7 @@ void TracingApp::StopAndFlush() {
   // support this directly we do our own MojoWaitMany over the handles and read
   // individual messages until all are closed or our absolute deadline has
   // elapsed.
-  static const MojoDeadline kTimeToWaitMicros = 5000 * 1000;
+  static const MojoDeadline kTimeToWaitMicros = 5 * 1000000;
   MojoTimeTicks end = MojoGetTimeTicksNow() + kTimeToWaitMicros;
 
   while (!recorder_impls_.empty()) {