[Fetch API] Reflect spec changes of bodyUsed property

third_party/WebKit/Source/modules/fetch/Body.cpp

 // 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.
 
 #include "config.h"
 #include "modules/fetch/Body.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 174 matching lines @@
     if (bodyBuffer()) {
         bodyBuffer()->startLoading(scriptState->executionContext(), FetchDataLoader::createLoaderAsString(), new BodyTextConsumer(resolver));
     } else {
         resolver->resolve(String());
     }
     return promise;
 }
 
 ReadableByteStream* Body::body()
 {
+    return bodyBuffer() ? bodyBuffer()->stream() : nullptr;
+}
+
+ReadableByteStream* Body::bodyWithUseCounter()
+{
     UseCounter::count(executionContext(), UseCounter::FetchBodyStream);
-    return bodyBuffer() ? bodyBuffer()->stream() : nullptr;
+    return body();
 }
 
 bool Body::bodyUsed()
 {
-    return m_bodyPassed || (body() && body()->isLocked());
+    return body() && body()->isDisturbed();
+}
+
+bool Body::isBodyLocked()
+{
+    return body() && body()->isLocked();
 }
 
 bool Body::hasPendingActivity() const
 {
     if (executionContext()->activeDOMObjectsAreStopped())
         return false;
     if (!bodyBuffer())
         return false;
     return bodyBuffer()->hasPendingActivity();
 }
 
-Body::Body(ExecutionContext* context) : ActiveDOMObject(context), m_bodyPassed(false), m_opaque(false)
+Body::Body(ExecutionContext* context) : ActiveDOMObject(context), m_opaque(false)
 {
     suspendIfNeeded();
 }
 
 ScriptPromise Body::rejectInvalidConsumption(ScriptState* scriptState)
 {
     if (m_opaque)
         return ScriptPromise::reject(scriptState, V8ThrowException::createTypeError(scriptState->isolate(), "The body is opaque."));
-    if (bodyUsed())
+    if (isBodyLocked() || bodyUsed())
         return ScriptPromise::reject(scriptState, V8ThrowException::createTypeError(scriptState->isolate(), "Already read"));
     return ScriptPromise();
 }
 
 } // namespace blink