[WebSocket] bufferedAmount should not decrease inside a task.

Source/web/WebSocketImpl.h

Index: Source/web/WebSocketImpl.h
diff --git a/Source/web/WebSocketImpl.h b/Source/web/WebSocketImpl.h
index 73180bfd2effd8cfbae214351cdadc3236f76ba4..3853696c604876a9ab1476aded6d34f6812d85ce 100644
--- a/Source/web/WebSocketImpl.h
+++ b/Source/web/WebSocketImpl.h
@@ -71,9 +71,9 @@ public:
     virtual void didReceiveMessage(const String& message) OVERRIDE;
     virtual void didReceiveBinaryData(PassOwnPtr<Vector<char> > binaryData) OVERRIDE;
     virtual void didReceiveMessageError() OVERRIDE;
-    virtual void didUpdateBufferedAmount(unsigned long bufferedAmount) OVERRIDE;
+    virtual void didConsumeBufferedAmount(unsigned long consumed) OVERRIDE;
     virtual void didStartClosingHandshake() OVERRIDE;
-    virtual void didClose(unsigned long bufferedAmount, ClosingHandshakeCompletionStatus, unsigned short code, const String& reason) OVERRIDE;
+    virtual void didClose(ClosingHandshakeCompletionStatus, unsigned short code, const String& reason) OVERRIDE;
 
 private:
     RefPtrWillBePersistent<WebCore::WebSocketChannel> m_private;
@@ -81,6 +81,10 @@ private:
     BinaryType m_binaryType;
     WebString m_subprotocol;
     WebString m_extensions;
+    bool m_isClosingOrClosed;
+    // m_bufferedAmount includes m_bufferedAmountAfterClose.
+    unsigned long m_bufferedAmount;
+    unsigned long m_bufferedAmountAfterClose;
 };
 
 } // namespace blink