Expose Durable Storage API to script

Source/modules/quota/StorageManager.h

Index: Source/modules/quota/StorageManager.h
diff --git a/Source/modules/quota/StorageManager.h b/Source/modules/quota/StorageManager.h
new file mode 100644
index 0000000000000000000000000000000000000000..dcd80ff02974211aa97f0410fe73378e1ff750f1
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+++ b/Source/modules/quota/StorageManager.h
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+// Copyright 2015 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 StorageManager_h
+#define StorageManager_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "platform/heap/Heap.h"
+
+namespace blink {
+
+class ScriptPromise;
+class ScriptState;
+
+class StorageManager final : public GarbageCollected<StorageManager>, public ScriptWrappable {
+DEFINE_WRAPPERTYPEINFO();
+public:
+    ScriptPromise requestPersistent(ScriptState*);
+    ScriptPromise persistentPermission(ScriptState*);
+    DECLARE_TRACE();
+};
+
+} // namespace blink
+
+#endif // StorageManager_h