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

Source/web/tests/mocks/MockNetwork.h

Index: Source/web/tests/mocks/MockNetwork.h
diff --git a/Source/web/tests/mocks/MockNetwork.h b/Source/web/tests/mocks/MockNetwork.h
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index 0000000000000000000000000000000000000000..446e709cac1af76fa7b751f8974de10b864b80ff
--- /dev/null
+++ b/Source/web/tests/mocks/MockNetwork.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 MockNetwork_h
+#define MockNetwork_h
+
+#include "public/platform/WebURLLoaderTestDelegate.h"
+#include "wtf/HashMap.h"
+#include "wtf/text/StringHash.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class MockRequest;
+class WebURLLoader;
+class WebURLLoaderClient;
+class WebURLResponse;
+
+class MockNetwork final : public WebURLLoaderTestDelegate {
+public:
+    MockNetwork();
+    ~MockNetwork();
+
+private:
+    friend class MockRequest;
+
+    static MockNetwork& current();
+
+    void servePendingRequests();
+    void addMockRequest(MockRequest&);
+    void removeMockRequest(MockRequest&);
+
+    // WebURLLoaderTestDelegate
+    void didReceiveResponse(WebURLLoaderClient*, WebURLLoader*, const WebURLResponse&) override;
+    void didReceiveData(WebURLLoaderClient*, WebURLLoader*, const char* data, int dataLength, int encodedDataLength) override;
+    void didFail(WebURLLoaderClient*, WebURLLoader*, const WebURLError&) override;
+    void didFinishLoading(WebURLLoaderClient*, WebURLLoader*, double finishTime, int64_t totalEncodedDataLength) override;
+
+    MockRequest* m_currentRequest;
+    HashMap<String, MockRequest*> m_requests;
+};
+
+} // namespace blink
+
+#endif