Persist sessionStorage on disk.

content/browser/dom_storage/dom_storage_context_impl.h

Index: content/browser/dom_storage/dom_storage_context_impl.h
diff --git a/content/browser/dom_storage/dom_storage_context_impl.h b/content/browser/dom_storage/dom_storage_context_impl.h
index b4771edf963d0509b80794fa1432663542db2767..884c9099125d60eb640398c716da7cb5225bae33 100644
--- a/content/browser/dom_storage/dom_storage_context_impl.h
+++ b/content/browser/dom_storage/dom_storage_context_impl.h
@@ -13,6 +13,10 @@
 #include "content/public/browser/dom_storage_context.h"
 #include "webkit/dom_storage/dom_storage_types.h"
 
+namespace content {
+class SessionStorageNamespace;
+}
+
 namespace dom_storage {
 class DomStorageContext;
 }
@@ -29,7 +33,8 @@ class CONTENT_EXPORT DOMStorageContextImpl :
  public:
   // If |data_path| is empty, nothing will be saved to disk.
   DOMStorageContextImpl(const FilePath& data_path,
-                        quota::SpecialStoragePolicy* special_storage_policy);
+                        quota::SpecialStoragePolicy* special_storage_policy,
+                        bool session_storage_on_disk);
 
   // DOMStorageContext implementation.
   virtual void GetAllStorageFiles(
@@ -38,6 +43,10 @@ class CONTENT_EXPORT DOMStorageContextImpl :
   virtual void DeleteForOrigin(const string16& origin_id) OVERRIDE;
   virtual void DeleteLocalStorageFile(const FilePath& file_path) OVERRIDE;
   virtual void DeleteDataModifiedSince(const base::Time& cutoff) OVERRIDE;
+  virtual void DoomSessionStorage(int64 namespace_id) OVERRIDE;
+
+  virtual content::SessionStorageNamespace* CreateSessionStorage(
+      const std::string& persistent_id) OVERRIDE;
 
   // Called to free up memory that's not strictly needed.
   void PurgeMemory();