Persist sessionStorage on disk.

chrome/browser/profiles/profile_impl.h

 // 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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #pragma once
 
@@ skipping 49 matching lines @@
   virtual net::URLRequestContextGetter* GetRequestContextForRenderProcess(
       int renderer_child_id) OVERRIDE;
   virtual net::URLRequestContextGetter* GetRequestContextForMedia() OVERRIDE;
   virtual content::ResourceContext* GetResourceContext() OVERRIDE;
   virtual content::GeolocationPermissionContext*
       GetGeolocationPermissionContext() OVERRIDE;
   virtual content::SpeechRecognitionPreferences*
       GetSpeechRecognitionPreferences() OVERRIDE;
   virtual bool DidLastSessionExitCleanly() OVERRIDE;
   virtual quota::SpecialStoragePolicy* GetSpecialStoragePolicy() OVERRIDE;
+  virtual bool ShouldSaveSessionStorageOnDisk() const OVERRIDE;

[sail, 2012/07/11 16:56:11]

I'm not sure what session storage is. Does this really need to be a per profile
flag? Currently the implementation is not profile specific. Should there be a
TODO somewhere?

[marja, 2012/07/12 09:22:03]

sessionStorage is part of the HTML5 DOM storage specification, see e.g.,
http://www.whatwg.org/specs/web-apps/current-work/#storage

I changed the Profile-related parts (according to jam's comments), so this
function doesn't exist any more, but instead ProfileImpl ctor retrieves a
DOMStorageContext and calls SetSaveSessionStorageOnDisk on it. This also makes
the changes to Profile minimal.

The DOM storage is per-profile (the data is stored under the profile directory),
and for incognito profiles both localStorage and sessionStorage are stored only
in memory.

 
   // Profile implementation:
   virtual std::string GetProfileName() OVERRIDE;
   virtual bool IsOffTheRecord() const OVERRIDE;
   virtual Profile* GetOffTheRecordProfile() OVERRIDE;
   virtual void DestroyOffTheRecordProfile() OVERRIDE;
   virtual bool HasOffTheRecordProfile() OVERRIDE;
   virtual Profile* GetOriginalProfile() OVERRIDE;
   virtual history::TopSites* GetTopSites() OVERRIDE;
   virtual history::TopSites* GetTopSitesWithoutCreating() OVERRIDE;
@@ skipping 186 matching lines @@
   Profile::Delegate* delegate_;
 
   chrome_browser_net::Predictor* predictor_;
 
   bool session_restore_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_