Add some trace points to mojo_shell for app lifetime

shell/application_manager/application_manager.cc

Index: shell/application_manager/application_manager.cc
diff --git a/shell/application_manager/application_manager.cc b/shell/application_manager/application_manager.cc
index 8ffe80860d6f97e3011363cf8e6b59330a17b108..cb9ed293dfab1ebb26dbb9d7f02999293ef95181 100644
--- a/shell/application_manager/application_manager.cc
+++ b/shell/application_manager/application_manager.cc
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
+#include "base/trace_event/trace_event.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/bindings/error_handler.h"
 #include "mojo/services/content_handler/public/interfaces/content_handler.mojom.h"
@@ -111,6 +112,9 @@ void ApplicationManager::ConnectToApplication(
     const GURL& requestor_url,
     InterfaceRequest<ServiceProvider> services,
     ServiceProviderPtr exposed_services) {
+  TRACE_EVENT_INSTANT1("mojo_shell", "ApplicationManager::ConnectToApplication",
+                       TRACE_EVENT_SCOPE_THREAD, "requested_url",
+                       requested_url.spec());
   DCHECK(requested_url.is_valid());
 
   // We check both the mapped and resolved urls for existing shell_impls because
@@ -330,6 +334,8 @@ void ApplicationManager::RunNativeApplication(
     return;
   }
 
+  TRACE_EVENT1("mojo_shell", "ApplicationManager::RunNativeApplication", "path",
+               path.AsUTF8Unsafe());
   NativeRunner* runner = native_runner_factory_->Create(options).release();
   native_runners_.push_back(runner);
   runner->Start(path, cleanup_behavior, application_request.Pass(),