Add comment to BodyStreamBuffer accessors for Response class

third_party/WebKit/Source/modules/fetch/Response.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 Response_h
 #define Response_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
@@ skipping 49 matching lines @@
     Response* clone(ScriptState*, ExceptionState&);
 
     // ActiveScriptWrappable
     bool hasPendingActivity() const final;
 
     // Does not call response.setBlobDataHandle().
     void populateWebServiceWorkerResponse(WebServiceWorkerResponse& /* response */);
 
     bool hasBody() const;
     BodyStreamBuffer* bodyBuffer() override { return m_response->buffer(); }
+    // Returns the BodyStreamBuffer of |m_response|. This method doesn't check
+    // the internal response of |m_response| even if |m_response| has it.
     const BodyStreamBuffer* bodyBuffer() const override { return m_response->buffer(); }
+    // Returns the BodyStreamBuffer of the internal response of |m_response| if
+    // any. Otherwise, returns one of |m_response|.
     BodyStreamBuffer* internalBodyBuffer() { return m_response->internalBuffer(); }
     const BodyStreamBuffer* internalBodyBuffer() const { return m_response->internalBuffer(); }
     bool bodyUsed() override;
 
     String mimeType() const override;
     String internalMIMEType() const;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit Response(ExecutionContext*);
     Response(ExecutionContext*, FetchResponseData*);
     Response(ExecutionContext*, FetchResponseData*, Headers*);
 
     void installBody();
     void refreshBody(ScriptState*);
 
     const Member<FetchResponseData> m_response;
     const Member<Headers> m_headers;
 };
 
 } // namespace blink
 
 #endif // Response_h