Expose Durable Storage API to script

Source/modules/quota/NavigatorStorageQuota.h

Index: Source/modules/quota/NavigatorStorageQuota.h
diff --git a/Source/modules/quota/NavigatorStorageQuota.h b/Source/modules/quota/NavigatorStorageQuota.h
index 951d46be1e263decde24cc508244decae9701f30..c10996adbb2198d927f9ee5ffbfc3be71cc91f11 100644
--- a/Source/modules/quota/NavigatorStorageQuota.h
+++ b/Source/modules/quota/NavigatorStorageQuota.h
@@ -40,6 +40,7 @@ namespace blink {
 
 class LocalFrame;
 class Navigator;
+class StorageManager;
 class StorageQuota;
 
 class NavigatorStorageQuota final : public GarbageCollectedFinalized<NavigatorStorageQuota>, public HeapSupplement<Navigator>, public DOMWindowProperty {
@@ -51,10 +52,12 @@ public:
     static StorageQuota* storageQuota(Navigator&);
     static DeprecatedStorageQuota* webkitTemporaryStorage(Navigator&);
     static DeprecatedStorageQuota* webkitPersistentStorage(Navigator&);
+    static StorageManager* storage(Navigator&);
 
     StorageQuota* storageQuota() const;
     DeprecatedStorageQuota* webkitTemporaryStorage() const;
     DeprecatedStorageQuota* webkitPersistentStorage() const;
+    StorageManager* storage() const;
 
     DECLARE_TRACE();
 
@@ -65,6 +68,7 @@ private:
     mutable Member<StorageQuota> m_storageQuota;
     mutable Member<DeprecatedStorageQuota> m_temporaryStorage;
     mutable Member<DeprecatedStorageQuota> m_persistentStorage;
+    mutable Member<StorageManager> m_storageManager;
 };
 
 } // namespace blink