Persist sessionStorage on disk.

content/browser/dom_storage/dom_storage_context_impl.cc

Index: content/browser/dom_storage/dom_storage_context_impl.cc
diff --git a/content/browser/dom_storage/dom_storage_context_impl.cc b/content/browser/dom_storage/dom_storage_context_impl.cc
index 683e105d7d4587564208ed0abe0bd487c1195c76..91d3e36049b8b4daf452718baa20927ee6d7c0eb 100644
--- a/content/browser/dom_storage/dom_storage_context_impl.cc
+++ b/content/browser/dom_storage/dom_storage_context_impl.cc
@@ -26,6 +26,7 @@ using webkit_database::DatabaseUtil;
 namespace {
 
 const char kLocalStorageDirectory[] = "Local Storage";
+const char kSessionStorageDirectory[] = "Session Storage";
 
 // TODO(michaeln): Fix the content layer api, FilePaths and
 // string16 origin_ids are just wrong. Then get rid of
@@ -86,7 +87,8 @@ DOMStorageContextImpl::DOMStorageContextImpl(
   context_ = new dom_storage::DomStorageContext(
       data_path.empty() ?
           data_path : data_path.AppendASCII(kLocalStorageDirectory),
-      FilePath(),  // Empty session storage directory.
+      data_path.empty() ?
+          data_path : data_path.AppendASCII(kSessionStorageDirectory),
       special_storage_policy,
       new DomStorageWorkerPoolTaskRunner(
           worker_pool,
@@ -142,6 +144,16 @@ void DOMStorageContextImpl::DeleteDataModifiedSince(const base::Time& cutoff) {
                  cutoff));
 }
 
+void DOMStorageContextImpl::AssociateSessionStorage(
+    int64 namespace_id, int64 real_id) {
+  DCHECK(context_);
+  context_->task_runner()->PostShutdownBlockingTask(
+      FROM_HERE,
+      DomStorageTaskRunner::PRIMARY_SEQUENCE,
+      base::Bind(&DomStorageContext::AssociateSessionStorage, context_,
+                 namespace_id, real_id));
+}
+
 void DOMStorageContextImpl::PurgeMemory() {
   DCHECK(context_);
   context_->task_runner()->PostShutdownBlockingTask(