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, 11 insertions, 0 deletions

diff --git a/chrome/browser/browser_main.cc b/chrome/browser/browser_main.cc
index a92805e..e7afaff 100644
--- a/chrome/browser/browser_main.cc
+++ b/chrome/browser/browser_main.cc
@@ -510,6 +510,10 @@ void RunUIMessageLoop(BrowserProcess* browser_process) {
 #elif defined(OS_POSIX)
   MessageLoopForUI::current()->Run();
 #endif
+#if defined(OS_CHROMEOS)
+  chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("UIMessageLoopEnded",
+                                                        true);
+#endif
 
   TRACE_EVENT_END("BrowserMain:MESSAGE_LOOP", 0, "");
 }
@@ -1671,6 +1675,13 @@ int BrowserMain(const MainFunctionParams& parameters) {
   ignore_result(browser_process.release());
   browser_shutdown::Shutdown();
 
+#if defined(OS_CHROMEOS)
+  // To be precise, logout (browser shutdown) is not yet done, but the
+  // remaining work is negligible, hence we say LogoutDone here.
+  chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutDone",
+                                                        false);
+  chromeos::BootTimesLoader::Get()->WriteLogoutTimes();
+#endif
   TRACE_EVENT_END("BrowserMain", 0, 0);
   return result_code;
 }