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

Source/web/tests/sim/SimLayerTreeView.h

+// 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 SimLayerTreeView_h
+#define SimLayerTreeView_h
+
+#include "public/platform/WebLayerTreeView.h"
+#include "wtf/OwnPtr.h"
+
+namespace blink {
+
+class SimLayerTreeView : public WebLayerTreeView {
+public:
+    SimLayerTreeView();
+
+    void setNeedsAnimate() override { m_needsAnimate = true; }
+    bool needsAnimate() const { return m_needsAnimate; }
+
+    void setDeferCommits(bool deferCommits) override { m_deferCommits = deferCommits; }
+    bool deferCommits() const { return m_deferCommits; }
+
+private:
+    bool m_needsAnimate;
+    bool m_deferCommits;
+};
+
+} // namespace blink
+
+#endif