BodyStreamBuffer's drainAs* function should lock stream

third_party/WebKit/Source/modules/fetch/BodyStreamBuffer.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 BodyStreamBuffer_h
 #define BodyStreamBuffer_h
 
 #include "core/dom/DOMException.h"
 #include "core/streams/ReadableByteStream.h"
 #include "core/streams/ReadableByteStreamReader.h"
@@ skipping 15 matching lines @@
     WTF_MAKE_NONCOPYABLE(BodyStreamBuffer);
     USING_GARBAGE_COLLECTED_MIXIN(BodyStreamBuffer);
     // Needed because we have to release |m_reader| promptly.
     EAGERLY_FINALIZE();
 public:
     // |handle| cannot be null and cannot be locked.
     explicit BodyStreamBuffer(PassOwnPtr<FetchDataConsumerHandle> /* handle */);
 
     ReadableByteStream* stream() { return m_stream; }
 
-    // Callable only when not locked.
-    PassRefPtr<BlobDataHandle> drainAsBlobDataHandle(FetchDataConsumerHandle::Reader::BlobSizePolicy);
-    PassRefPtr<EncodedFormData> drainAsFormData();
+    // Callable only when neither locked nor disturbed.
+    PassRefPtr<BlobDataHandle> drainAsBlobDataHandle(ExecutionContext*, FetchDataConsumerHandle::Reader::BlobSizePolicy);
+    PassRefPtr<EncodedFormData> drainAsFormData(ExecutionContext*);
     void startLoading(ExecutionContext*, FetchDataLoader*, FetchDataLoader::Client* /* client */);
 
     // Callable only when not locked. Returns a non-null handle.
     // There is no means to "return" the handle to the body buffer: Calling
     // this function locks, disturbs and closes the stream and no one will
     // not be able to get any information from the stream and this buffer after
     // that.
     PassOwnPtr<FetchDataConsumerHandle> releaseHandle(ExecutionContext*);
 
     bool hasPendingActivity() const;
@@ skipping 31 matching lines @@
     OwnPtr<FetchDataConsumerHandle::Reader> m_reader;
     Member<ReadableByteStream> m_stream;
     // We need this member to keep it alive while loading.
     Member<FetchDataLoader> m_loader;
     bool m_streamNeedsMore;
 };
 
 } // namespace blink
 
 #endif // BodyStreamBuffer_h