Response construction with a ReadableStream

third_party/WebKit/Source/bindings/core/v8/V8IteratorResultValue.h

 // 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 V8IteratorResultValue_h
 #define V8IteratorResultValue_h
 
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ToV8.h"
 #include "core/CoreExport.h"
 #include <v8.h>
 
 namespace blink {
 
+// "Iterator result" in this file is an object returned from iterator.next()
+// having two members "done" and "value".
+
 CORE_EXPORT v8::Local<v8::Object> v8IteratorResultValue(v8::Isolate*, bool done, v8::Local<v8::Value>);
 
+// Unpacks |result|, stores the value of "done" member to |done| and returns
+// the value of "value" member. Returns an empty handle when errored.
+CORE_EXPORT v8::MaybeLocal<v8::Value> v8UnpackIteratorResult(ScriptState*, v8::Local<v8::Object> result, bool* done);
+
 template<typename T>
 inline ScriptValue v8IteratorResult(ScriptState* scriptState, const T& value)
 {
     return ScriptValue(
         scriptState,
         v8IteratorResultValue(
             scriptState->isolate(),
             false,
             toV8(value, scriptState->context()->Global(), scriptState->isolate())));
 }
 
 inline ScriptValue v8IteratorResultDone(ScriptState* scriptState)
 {
     return ScriptValue(
         scriptState,
         v8IteratorResultValue(
             scriptState->isolate(),
             true,
             v8::Undefined(scriptState->isolate())));
 }
 
 } // namespace blink
 
 #endif // V8IteratorResultValue_h