[ServiceWorker] Implement Headers class.

Source/modules/serviceworkers/Headers.h

Index: Source/modules/serviceworkers/Headers.h
diff --git a/Source/modules/serviceworkers/Headers.h b/Source/modules/serviceworkers/Headers.h
new file mode 100644
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+++ b/Source/modules/serviceworkers/Headers.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 Headers_h
+#define Headers_h
+
+#include "bindings/v8/ScriptWrappable.h"
+#include "modules/serviceworkers/FetchHeaderList.h"
+#include "wtf/Forward.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/RefCounted.h"
+
+namespace WebCore {
+
+class Dictionary;
+class ExceptionState;
+class HeadersForEachCallback;
+class ScriptValue;
+
+// http://fetch.spec.whatwg.org/#headers-class
+class Headers FINAL : public RefCounted<Headers>, public ScriptWrappable {
+public:
+    enum Guard { ImmutableGuard, RequestGuard, RequestNoCORSGuard, ResponseGuard, NoneGuard };
+
+    static PassRefPtr<Headers> create();
+    static PassRefPtr<Headers> create(ExceptionState&);
+    static PassRefPtr<Headers> create(const Headers*, ExceptionState&);
+    static PassRefPtr<Headers> create(const Dictionary&, ExceptionState&);
+
+    ~Headers();
+
+    // Shares the FetchHeaderList. Called when creating a Request or Response.
+    static PassRefPtr<Headers> create(FetchHeaderList*);
+
+    // Headers.idl implementation.
+    void append(const String& name, const String& value, ExceptionState&);
+    void remove(const String& key, ExceptionState&);
+    String get(const String& key, ExceptionState&);
+    Vector<String> getAll(const String& key, ExceptionState&);
+    bool has(const String& key, ExceptionState&);
+    void set(const String& key, const String& value, ExceptionState&);
+    unsigned long size() const;
+    void forEach(PassOwnPtr<HeadersForEachCallback>, ScriptValue&);
+    void forEach(PassOwnPtr<HeadersForEachCallback>);
+
+    void setGuard(Guard guard) { m_guard = guard; }
+    Guard guard() const { return m_guard; }
+
+private:
+    Headers();
+    // Shares the FetchHeaderList. Called when creating a Request or Response.
+    explicit Headers(FetchHeaderList*);
+    void forEachInternal(PassOwnPtr<HeadersForEachCallback>, ScriptValue*);
+
+    void fillWith(const Headers*, ExceptionState&);
+    void fillWith(const Dictionary&, ExceptionState&);
+
+    RefPtr<FetchHeaderList> m_headerList;
+    Guard m_guard;
+};
+
+} // namespace WebCore
+
+#endif // Headers_h