Record logout time stats for Chrome OS.

Record lougout time stats and dump it to /tmp/logout-times-sent.
ShutdownTime.Logout, ShutdownTime.UIMessageLoopEnded, and
ShutdownTime.BrowserDeleted will be sent to UMA, as well.

% cat /tmp/logout-times-sent
ShutdownTime.Logout: 0.39
0.00 +0.00 LogoutStarted
0.00 +0.00 ShutdownDetected
0.02 +0.02 StartedClosingWindows
0.27 +0.25 UIMessageLoopEnded
0.27 +0.00 BrowserShutdownStarted
0.39 +0.12 BrowserDeleted
0.39 +0.00 BrowserMainEnded

Along the way, change BootTimesLoader to append data to existing
/tmp/uptime-* files just like /sbin/bootstat does, so we can collect
numbers from 2nd login as well.

BUG=chromium-os:6847
TEST=confirmed that /tmp/login-times-sent and /tmp/logout-times-sent are written properly.

Review URL: http://codereview.chromium.org/4973002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@66923 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 0 deletions

diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 1415035..cb6dd29 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -130,6 +130,7 @@
 
 #if defined(OS_CHROMEOS)
 #include <gdk/gdk.h>  // For GdkScreen
+#include "chrome/browser/chromeos/boot_times_loader.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/login_library.h"
 #include "chrome/browser/chromeos/options/language_config_view.h"
@@ -1462,6 +1463,11 @@ void Browser::Search() {
 void Browser::Exit() {
   UserMetrics::RecordAction(UserMetricsAction("Exit"), profile_);
 #if defined(OS_CHROMEOS)
+  chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutStarted", false);
+  // Write /tmp/uptime-logout-started as well.
+  const char kLogoutStarted[] = "logout-started";
+  chromeos::BootTimesLoader::Get()->RecordCurrentStats(kLogoutStarted);
+
   if (chromeos::CrosLibrary::Get()->EnsureLoaded()) {
     chromeos::CrosLibrary::Get()->GetLoginLibrary()->StopSession("");
     return;