Add comment to BodyStreamBuffer accessors for Response class

third_party/WebKit/Source/modules/fetch/FetchResponseData.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 FetchResponseData_h
 #define FetchResponseData_h
 
 #include "core/fetch/CrossOriginAccessControl.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
@@ skipping 41 matching lines @@
 
     FetchResponseData* clone(ScriptState*);
 
     Type getType() const { return m_type; }
     const KURL& url() const { return m_url; }
     unsigned short status() const { return m_status; }
     AtomicString statusMessage() const { return m_statusMessage; }
     FetchHeaderList* headerList() const { return m_headerList.get(); }
     BodyStreamBuffer* buffer() const { return m_buffer; }
     String mimeType() const;
+    // Returns the BodyStreamBuffer of |m_internalResponse| if any. Otherwise,
+    // returns |m_buffer|.
     BodyStreamBuffer* internalBuffer() const;
     String internalMIMEType() const;
     int64_t responseTime() const { return m_responseTime; }
     String cacheStorageCacheName() const { return m_cacheStorageCacheName; }
     const HTTPHeaderSet& corsExposedHeaderNames() const { return m_corsExposedHeaderNames; }
 
     void setURL(const KURL& url) { m_url = url; }
     void setStatus(unsigned short status) { m_status = status; }
     void setStatusMessage(AtomicString statusMessage) { m_statusMessage = statusMessage; }
     void setMIMEType(const String& type) { m_mimeType = type; }
@@ skipping 26 matching lines @@
     Member<BodyStreamBuffer> m_buffer;
     String m_mimeType;
     int64_t m_responseTime;
     String m_cacheStorageCacheName;
     HTTPHeaderSet m_corsExposedHeaderNames;
 };
 
 } // namespace blink
 
 #endif // FetchResponseData_h