Persist sessionStorage on disk.

content/public/browser/browser_context.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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 
 #include "base/hash_tables.h"
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
@@ skipping 105 matching lines @@
   // ref counted class, so callers should take a reference if needed. It's valid
   // to return NULL.
   virtual SpeechRecognitionPreferences* GetSpeechRecognitionPreferences() = 0;
 
   // Returns true if the last time this context was open it was exited cleanly.
   // This doesn't belong here; http://crbug.com/90737
   virtual bool DidLastSessionExitCleanly() = 0;
 
   // Returns a special storage policy implementation, or NULL.
   virtual quota::SpecialStoragePolicy* GetSpecialStoragePolicy() = 0;
+
+  // Returns true if sessionStorage should be saved on disk. If |IsOffTheRecord|
+  // is true, it won't be saved even if this returns true.
+  virtual bool ShouldSaveSessionStorageOnDisk() const;
 };
 
 }  // namespace content
 
 #if defined(COMPILER_GCC)
 namespace BASE_HASH_NAMESPACE {
 
 template<>
 struct hash<content::BrowserContext*> {
   std::size_t operator()(content::BrowserContext* const& p) const {
     return reinterpret_cast<std::size_t>(p);
   }
 };
 
 }  // namespace BASE_HASH_NAMESPACE
 #endif
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_