Restore sessionStorage when chrome restarts.

content/browser/in_process_webkit/dom_storage_message_filter.h

Index: content/browser/in_process_webkit/dom_storage_message_filter.h
diff --git a/content/browser/in_process_webkit/dom_storage_message_filter.h b/content/browser/in_process_webkit/dom_storage_message_filter.h
index 75839c2b2e974e5c5f6ae09cf531784d1484912e..3e9e4be115693376900ca3442d852f4a573e223f 100644
--- a/content/browser/in_process_webkit/dom_storage_message_filter.h
+++ b/content/browser/in_process_webkit/dom_storage_message_filter.h
@@ -40,6 +40,9 @@ class DOMStorageMessageFilter : public content::BrowserMessageFilter {
       const NullableString16& old_value, const NullableString16& new_value,
       const string16& origin, const GURL& url, bool is_local_storage);
 
+  // Only call on the WebKit thread.
+  static void SetIgnoreStorageEvents(bool ignore_storage_events);
+
  private:
   friend class content::BrowserThread;
   friend class base::DeleteHelper<DOMStorageMessageFilter>;
@@ -68,6 +71,9 @@ class DOMStorageMessageFilter : public content::BrowserMessageFilter {
     return webkit_context_->dom_storage_context();
   }
 
+  void NotifyOnUIThread(int64 namespace_id,
+                        const FilePath& session_storage_directory);
+
   // Use whenever there's a chance OnStorageEvent will be called.
   class ScopedStorageEventContext {
    public:
@@ -80,6 +86,7 @@ class DOMStorageMessageFilter : public content::BrowserMessageFilter {
   // Only access on the WebKit thread!  Used for storage events.
   static DOMStorageMessageFilter* storage_event_message_filter;
   static const GURL* storage_event_url_;
+  static bool ignore_storage_events_;
 
   // Data shared between renderer processes with the same browser context.
   scoped_refptr<WebKitContext> webkit_context_;