Add comment to BodyStreamBuffer accessors for Response class

third_party/WebKit/Source/modules/fetch/Response.h

Index: third_party/WebKit/Source/modules/fetch/Response.h
diff --git a/third_party/WebKit/Source/modules/fetch/Response.h b/third_party/WebKit/Source/modules/fetch/Response.h
index b05e275346c74b3780d5bb0afe0f69e7cae869f5..1edeec8c3004e8fbe57e0a5a271ea35f1070ff38 100644
--- a/third_party/WebKit/Source/modules/fetch/Response.h
+++ b/third_party/WebKit/Source/modules/fetch/Response.h
@@ -67,7 +67,11 @@ public:
 
     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;