Persist sessionStorage on disk.

chrome/browser/ui/startup/startup_browser_creator_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/startup/startup_browser_creator_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
@@ skipping 54 matching lines @@
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_result_codes.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "content/public/browser/child_process_security_policy.h"
+#include "content/public/browser/dom_storage_context.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "grit/locale_settings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
@@ skipping 527 matching lines @@
                                                       urls_to_open);
     AddInfoBarsIfNecessary(browser, chrome::startup::IS_PROCESS_STARTUP);
     return true;
   }
 
   Browser* browser = ProcessSpecifiedURLs(urls_to_open);
   if (!browser)
     return false;
 
   AddInfoBarsIfNecessary(browser, chrome::startup::IS_PROCESS_STARTUP);
+
+  // Session restore may occur if the startup preference is "last" or if the
+  // crash infobar is displayed. Otherwise, it's safe for the DOM storage system
+  // to start deleting leftover data.
+  if (pref.type != SessionStartupPref::LAST &&
+      !HasPendingUncleanExit(profile_)) {
+    content::DOMStorageContext* dom_storage_context =

[Peter Kasting, 2012/07/16 17:41:02]

Nit: Could also inline into next line and break after '->'

[marja, 2012/08/06 11:53:33]

Done.

+        content::BrowserContext::GetDOMStorageContext(profile_);
+    dom_storage_context->StartScavengingUnusedSessionStorage();
+  }
+
   return true;
 }
 
 Browser* StartupBrowserCreatorImpl::ProcessSpecifiedURLs(
     const std::vector<GURL>& urls_to_open) {
   SessionStartupPref pref =
       StartupBrowserCreator::GetSessionStartupPref(command_line_, profile_);
   StartupTabs tabs;
   // Pinned tabs should not be displayed when chrome is launched in incognito
   // mode. Also, no pages should be opened automatically if the session
@@ skipping 269 matching lines @@
         // New:
         prefs->GetString(prefs::kHomePage),
         prefs->GetBoolean(prefs::kHomePageIsNewTabPage),
         prefs->GetBoolean(prefs::kShowHomeButton),
         // Backup:
         backup_homepage,
         backup_homepage_is_ntp,
         backup_show_home_button));
   }
 }