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

Source/web/tests/sim/SimWebViewClient.h

Index: Source/web/tests/sim/SimWebViewClient.h
diff --git a/Source/web/tests/sim/SimWebViewClient.h b/Source/web/tests/sim/SimWebViewClient.h
new file mode 100644
index 0000000000000000000000000000000000000000..bfd9e4c865bf69281da6d5df043c08096523ecf1
--- /dev/null
+++ b/Source/web/tests/sim/SimWebViewClient.h
@@ -0,0 +1,26 @@
+// 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 SimWebViewClient_h
+#define SimWebViewClient_h
+
+#include "web/tests/FrameTestHelpers.h"
+
+namespace blink {
+
+class WebLayerTreeView;
+
+class SimWebViewClient final : public FrameTestHelpers::TestWebViewClient {
+public:
+    explicit SimWebViewClient(WebLayerTreeView&);
+
+    WebLayerTreeView* layerTreeView() override { return m_layerTreeView; }
+
+private:
+    WebLayerTreeView* m_layerTreeView;
+};
+
+} // namespace blink
+
+#endif