Add a test that we resume commits after inserting the body.

Source/web/tests/sim/SimRequest.h

Index: Source/web/tests/sim/SimRequest.h
diff --git a/Source/web/tests/sim/SimRequest.h b/Source/web/tests/sim/SimRequest.h
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+++ b/Source/web/tests/sim/SimRequest.h
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+// Copyright 2015 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 SimRequest_h
+#define SimRequest_h
+
+#include "public/platform/WebURLError.h"
+#include "public/platform/WebURLResponse.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class SimNetwork;
+class WebURLLoader;
+class WebURLLoaderClient;
+
+class SimRequest {
+public:
+    SimRequest(String url, String mimeType);
+
+    void didReceiveResponse(WebURLLoaderClient*, WebURLLoader*, const WebURLResponse&);
+    void didFail(const WebURLError&);
+
+    void start();
+    void write(const String& data);
+    void finish();
+
+    bool isReady() const { return m_isReady; }
+    const String& url() const { return m_url; }
+    const WebURLError& error() const { return m_error; }
+    const WebURLResponse& response() const { return m_response; }
+
+    void reset();
+
+private:
+    String m_url;
+    WebURLLoader* m_loader;
+    WebURLResponse m_response;
+    WebURLError m_error;
+    WebURLLoaderClient* m_client;
+    unsigned m_totalEncodedDataLength;
+    bool m_isReady;
+};
+
+} // namespace blink
+
+#endif