Add support for writing system traces at startup

content/browser/tracing/trace_controller_impl.cc

Index: content/browser/tracing/trace_controller_impl.cc
diff --git a/content/browser/tracing/trace_controller_impl.cc b/content/browser/tracing/trace_controller_impl.cc
index 54e0c86cb4268597afcdc557fa8bd0501761a90b..53e4ea5cae05fb44b09f45c02cda83f42f08acf9 100644
--- a/content/browser/tracing/trace_controller_impl.cc
+++ b/content/browser/tracing/trace_controller_impl.cc
@@ -26,9 +26,11 @@ base::LazyInstance<TraceControllerImpl>::Leaky g_controller =
 class AutoStopTraceSubscriberStdio : public TraceSubscriberStdio {
  public:
   AutoStopTraceSubscriberStdio(const base::FilePath& file_path)
-      : TraceSubscriberStdio(file_path) {}
+      : TraceSubscriberStdio(file_path,
+                             FILE_TYPE_PROPERTY_LIST,
+                             false) {}
 
-  static void EndStartupTrace(TraceSubscriberStdio* subscriber) {
+  static void EndStartupTrace(AutoStopTraceSubscriberStdio* subscriber) {
     if (!TraceControllerImpl::GetInstance()->EndTracingAsync(subscriber))
       delete subscriber;
     // else, the tracing will end asynchronously in OnEndTracingComplete().