Restore sessionStorage when chrome restarts.

content/browser/in_process_webkit/dom_storage_message_filter.cc

Index: content/browser/in_process_webkit/dom_storage_message_filter.cc
diff --git a/content/browser/in_process_webkit/dom_storage_message_filter.cc b/content/browser/in_process_webkit/dom_storage_message_filter.cc
index 6318c324ede361c47f43473013323f95197c9ede..38af60437de1d58c6c00f13f6ff1a5c45af8af0c 100644
--- a/content/browser/in_process_webkit/dom_storage_message_filter.cc
+++ b/content/browser/in_process_webkit/dom_storage_message_filter.cc
@@ -10,6 +10,8 @@
 #include "content/browser/in_process_webkit/dom_storage_context.h"
 #include "content/browser/in_process_webkit/dom_storage_namespace.h"
 #include "content/common/dom_storage_messages.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
 #include "content/public/browser/browser_thread.h"
 #include "googleurl/src/gurl.h"
 
@@ -110,16 +112,43 @@ void DOMStorageMessageFilter::OverrideThreadForMessage(
     *thread = BrowserThread::WEBKIT_DEPRECATED;
 }
 
+void DOMStorageMessageFilter::NotifyOnUIThread(
+    int64 namespace_id,
+    const FilePath& session_storage_directory) {
+  SessionStorageCreatedDetails details;
+  details.id = namespace_id;
+  details.session_storage_directory = session_storage_directory;
+  content::NotificationService::current()->Notify(
+      content::NOTIFICATION_SESSION_STORAGE_NAMESPACE_CREATED,
+      content::Source<DOMStorageMessageFilter>(this),
+      content::Details<SessionStorageCreatedDetails>(&details));
+}
+
 void DOMStorageMessageFilter::OnStorageAreaId(int64 namespace_id,
                                               const string16& origin,
                                               int64* storage_area_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
 
+  // Don't allow creation of the namespace.
   DOMStorageNamespace* storage_namespace =
-      Context()->GetStorageNamespace(namespace_id, true);
+      Context()->GetStorageNamespace(namespace_id, false);
   if (!storage_namespace) {
-    *storage_area_id = DOMStorageContext::kInvalidStorageId;
-    return;
+    // The namespace doesn't exist; create it and send a notification if it was
+    // a session storage.
+    storage_namespace =
+        Context()->GetStorageNamespace(namespace_id, true);
+    if (!storage_namespace) {
+      *storage_area_id = DOMStorageContext::kInvalidStorageId;
+      return;
+    }
+
+    if (storage_namespace->dom_storage_type() == DOM_STORAGE_SESSION) {
+      BrowserThread::PostTask(
+          BrowserThread::UI, FROM_HERE,
+          base::Bind(&DOMStorageMessageFilter::NotifyOnUIThread, this,
+                     namespace_id,
+                     storage_namespace->session_storage_directory()));
+    }
   }
   DOMStorageArea* storage_area = storage_namespace->GetStorageArea(origin);
   *storage_area_id = storage_area->id();