Add some trace points to mojo_shell for app lifetime

shell/application_manager/local_fetcher.cc

Index: shell/application_manager/local_fetcher.cc
diff --git a/shell/application_manager/local_fetcher.cc b/shell/application_manager/local_fetcher.cc
index 88339b0a85d9580679a79dcb013ba790cfd397bc..9b9a84384d2700d80c0aa6bece99c469b919bb57 100644
--- a/shell/application_manager/local_fetcher.cc
+++ b/shell/application_manager/local_fetcher.cc
@@ -10,6 +10,7 @@
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/trace_event/trace_event.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/common/data_pipe_utils.h"
 #include "url/url_util.h"
@@ -29,6 +30,7 @@ LocalFetcher::LocalFetcher(const GURL& url,
                            const GURL& url_without_query,
                            const FetchCallback& loader_callback)
     : Fetcher(loader_callback), url_(url), path_(UrlToFile(url_without_query)) {
+  TRACE_EVENT0("mojo_shell", "LocalFetcher::LocalFetcher");

[viettrungluu, 2015/03/24 20:04:34]

Should you record the url (with or without query, I'm not sure)?

[jamesr, 2015/03/27 20:42:21]

Done.

   loader_callback_.Run(make_scoped_ptr(this));
 }