Make session restore forced tab load delay Finch configurable, and separate first tab loads from su…

chrome/browser/sessions/tab_loader.h

Index: chrome/browser/sessions/tab_loader.h
diff --git a/chrome/browser/sessions/tab_loader.h b/chrome/browser/sessions/tab_loader.h
index 519d024f76d0e71c15abf3afedbaa9de5772040f..351083c44b9b20e02078284391555f8d5b80b114 100644
--- a/chrome/browser/sessions/tab_loader.h
+++ b/chrome/browser/sessions/tab_loader.h
@@ -69,7 +69,9 @@ class TabLoader : public content::NotificationObserver,
   void LoadNextTab();
 
   // Starts a timer to load load the next tab once expired before the current
-  // tab loading is finished.
+  // tab loading is finished. The first timer is used only once when loading the
+  // first batch of visible tabs.
+  void StartFirstTimer();

[gab, 2015/05/15 18:21:03]

I think it's more readable if we separate these two and their respective
comments.

[Nico, 2015/05/15 18:36:32]

+1

[chrisha, 2015/05/15 18:47:12]

Done.

   void StartTimer();
 
   // Removes the listeners from the specified tab and removes the tab from