Persist sessionStorage on disk.

webkit/dom_storage/dom_storage_namespace.cc

Index: webkit/dom_storage/dom_storage_namespace.cc
diff --git a/webkit/dom_storage/dom_storage_namespace.cc b/webkit/dom_storage/dom_storage_namespace.cc
index 656d244345258d5328f384241e07c3e2b7652ab5..6044282cfed58beb43f1d775cc5d4845cf668b69 100644
--- a/webkit/dom_storage/dom_storage_namespace.cc
+++ b/webkit/dom_storage/dom_storage_namespace.cc
@@ -9,6 +9,7 @@
 #include "webkit/dom_storage/dom_storage_area.h"
 #include "webkit/dom_storage/dom_storage_task_runner.h"
 #include "webkit/dom_storage/dom_storage_types.h"
+#include "webkit/dom_storage/session_storage_database.h"
 
 namespace dom_storage {
 
@@ -28,7 +29,19 @@ DomStorageNamespace::DomStorageNamespace(
   DCHECK_NE(kLocalStorageNamespaceId, namespace_id);
 }
 
+DomStorageNamespace::DomStorageNamespace(
+    int64 namespace_id,
+    SessionStorageDatabase* session_storage_database,
+    DomStorageTaskRunner* task_runner)
+    : namespace_id_(namespace_id),
+      task_runner_(task_runner),
+      session_storage_database_(session_storage_database) {
+  DCHECK_NE(kLocalStorageNamespaceId, namespace_id);
+}
+
 DomStorageNamespace::~DomStorageNamespace() {
+  if (session_storage_database_.get())
+    session_storage_database_->DeleteNamespace(namespace_id_);
 }
 
 DomStorageArea* DomStorageNamespace::OpenStorageArea(const GURL& origin) {
@@ -36,8 +49,18 @@ DomStorageArea* DomStorageNamespace::OpenStorageArea(const GURL& origin) {
     ++(holder->open_count_);
     return holder->area_;
   }
-  DomStorageArea* area = new DomStorageArea(namespace_id_, origin,
-                                            directory_, task_runner_);
+  DomStorageArea* area;
+  if (!directory_.empty()) {
+    // Local storage backed on disk.
+    area = new DomStorageArea(namespace_id_, origin, directory_, task_runner_);
+  } else if (session_storage_database_.get()) {
+    // Session storage backed on disk.
+    area = new DomStorageArea(namespace_id_, origin, session_storage_database_,
+                              task_runner_);
+  } else {
+    // In-memory.
+    area = new DomStorageArea(namespace_id_, origin, task_runner_);
+  }
   areas_[origin] = AreaHolder(area, 1);
   return area;
 }
@@ -54,8 +77,8 @@ void DomStorageNamespace::CloseStorageArea(DomStorageArea* area) {
 DomStorageNamespace* DomStorageNamespace::Clone(int64 clone_namespace_id) {
   DCHECK_NE(kLocalStorageNamespaceId, namespace_id_);
   DCHECK_NE(kLocalStorageNamespaceId, clone_namespace_id);
-  DomStorageNamespace* clone =
-      new DomStorageNamespace(clone_namespace_id, task_runner_);
+  DomStorageNamespace* clone = new DomStorageNamespace(
+      clone_namespace_id, session_storage_database_, task_runner_);
   AreaMap::const_iterator it = areas_.begin();
   for (; it != areas_.end(); ++it) {
     DomStorageArea* area = it->second.area_->ShallowCopy(clone_namespace_id);
@@ -74,6 +97,11 @@ void DomStorageNamespace::DeleteOrigin(const GURL& origin) {
     scoped_refptr<DomStorageArea> area =
         new DomStorageArea(namespace_id_, origin, directory_, task_runner_);
     area->DeleteOrigin();
+  } else if (session_storage_database_.get()) {
+    scoped_refptr<DomStorageArea> area =
+        new DomStorageArea(namespace_id_, origin,
+                           session_storage_database_.get(), task_runner_);
+    area->DeleteOrigin();
   }
 }