[Session restore] Add MRU logic to loading of background pages.

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 c6692162035c06fdb0cb02d7c1b7714f178e2d53..ac0960388c86d7f672765c30ccacad163a04ad7d 100644
--- a/chrome/browser/sessions/session_restore.cc
+++ b/chrome/browser/sessions/session_restore.cc
@@ -591,6 +591,12 @@ class SessionRestoreImpl : public content::NotificationObserver {
     // focused tab will be loaded by Browser, and TabLoader will load the rest.
     DCHECK(web_contents->GetController().NeedsReload());
 
+    // Restore the saved last active time. By default, the last active time of a
+    // WebContent is initially set to the creation time of the tab, which is not
+    // necessarly the same as the loading time. This makes sure that the state
+    // is preserved between restores.
+    web_contents->SetLastActiveTime(tab.last_active_time);
+
     return web_contents;
   }