Stub implementation of Permissions API module.

Source/modules/permissions/Permissions.h

Index: Source/modules/permissions/Permissions.h
diff --git a/Source/modules/permissions/Permissions.h b/Source/modules/permissions/Permissions.h
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+// Copyright 2014 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 Permissions_h
+#define Permissions_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "platform/heap/Handle.h"
+
+namespace WTF {
+class AtomicString;
+} // namespace WTF
+
+namespace blink {
+
+class ScriptState;
+
+class Permissions final
+    : public GarbageCollectedFinalized<Permissions>
+    , public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    virtual ~Permissions();
+
+    virtual void trace(Visitor*);
+
+    static ScriptPromise query(ScriptState*, const AtomicString&);
+};
+
+} // namespace blink
+
+#endif // Permissions_h