Support 'URLSearchParams' as the body of a Request

third_party/WebKit/Source/core/dom/URLSearchParams.h

 // 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 URLSearchParams_h
 #define URLSearchParams_h
 
 #include "bindings/core/v8/Iterable.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/UnionTypesCore.h"
 #include "platform/heap/Handle.h"
+#include "platform/network/EncodedFormData.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 #include <utility>
 
 namespace blink {
 
 class ExceptionState;
 
 typedef USVStringOrURLSearchParams URLSearchParamsInit;
 
@@ skipping 14 matching lines @@
     // URLSearchParams interface methods
     String toString() const;
     void append(const String& name, const String& value);
     void deleteAllWithName(const String&);
     String get(const String&) const;
     Vector<String> getAll(const String&) const;
     bool has(const String&) const;
     void set(const String& name, const String& value);
     void setInput(const String&);
 
+    // Internal helpers
+    PassRefPtr<EncodedFormData> encodeFormData() const;
+
     DECLARE_TRACE();
 
 private:
+    friend class URLSearchParamsTest_EncodedFormData_Test;
+
     explicit URLSearchParams(const String&);
     explicit URLSearchParams(URLSearchParams*);
     Vector<std::pair<String, String>> m_params;
 
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 } // namespace blink
 
 #endif // URLSearchParams_h