Add Startup Timing to CPM

chrome/browser/sessions/session_restore.cc

Index: chrome/browser/sessions/session_restore.cc
diff --git a/chrome/browser/sessions/session_restore.cc b/chrome/browser/sessions/session_restore.cc
index 5298b08da7e3da8ecf9ad7d3e31b42b19b1d741f..1c69bc9993488f816907b37555b681d13ae78b3e 100644
--- a/chrome/browser/sessions/session_restore.cc
+++ b/chrome/browser/sessions/session_restore.cc
@@ -20,6 +20,7 @@
 #include "base/stringprintf.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/performance_monitor/startup_timer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_service.h"
 #include "chrome/browser/sessions/session_service_factory.h"
@@ -440,6 +441,8 @@ void TabLoader::HandleTabClosedOrLoaded(NavigationController* tab) {
   if (tabs_loading_.empty() && tabs_to_load_.empty()) {
     base::TimeDelta time_to_load =
         base::TimeTicks::Now() - restore_started_;
+    performance_monitor::StartupTimer::SetElapsedSessionRestoreTime(

[sky, 2012/08/07 19:48:04]

What happens if this is invoked multiple times?

[Devlin, 2012/08/07 22:51:22]

Whoops, forgot that session restores can happen multiple times in one startup if
the user has multiple profiles signed in. Now each restore time will be
recorded.

+        time_to_load);
     UMA_HISTOGRAM_CUSTOM_TIMES(
         "SessionRestore.AllTabsLoaded",
         time_to_load,