Fix: Prerendering was confusing SessionService to not save sessionStorage.

chrome/browser/sessions/session_service.h

Index: chrome/browser/sessions/session_service.h
diff --git a/chrome/browser/sessions/session_service.h b/chrome/browser/sessions/session_service.h
index b1066405dccf260ffa63ea7513b6d7f39c2e2763..a61e67f012b3398aa594e88aa8d614baab88e7e3 100644
--- a/chrome/browser/sessions/session_service.h
+++ b/chrome/browser/sessions/session_service.h
@@ -16,6 +16,8 @@
 #include "chrome/browser/sessions/session_id.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_list_observer.h"
+#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/ui_base_types.h"
@@ -51,7 +53,9 @@ class NavigationEntry;
 // SessionService rebuilds the contents of the file from the open state
 // of the browser.
 class SessionService : public BaseSessionService,
-                       public content::NotificationObserver {
+                       public content::NotificationObserver,
+                       public chrome::BrowserListObserver,
+                       public TabStripModelObserver {
   friend class SessionServiceTestHelper;
  public:
   // Used to distinguish an application window from a normal one.
@@ -414,6 +418,22 @@ class SessionService : public BaseSessionService,
   void RecordUpdatedSessionNavigationOrTab(base::TimeDelta delta,
                                            bool use_long_period);
 
+  // chrome::BrowserListObserver implementation.
+  virtual void OnBrowserAdded(Browser* browser) OVERRIDE;
+  virtual void OnBrowserRemoved(Browser* browser) OVERRIDE;
+
+  // TabStripModelObserver implementation.
+  virtual void TabInsertedAt(TabContents* contents,
+                             int index,
+                             bool foreground) OVERRIDE;
+  virtual void TabClosingAt(TabStripModel* tab_strip_model,
+                            TabContents* contents,
+                            int index) OVERRIDE;
+  virtual void TabReplacedAt(TabStripModel* tab_strip_model,
+                             TabContents* old_contents,
+                             TabContents* new_contents,
+                             int index) OVERRIDE;
+
   // Convert back/forward between the Browser and SessionService DB window
   // types.
   static WindowType WindowTypeForBrowserType(Browser::Type type);