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diff --git a/Source/WebKit/chromium/tests/CCHeadsUpDisplayTest.cpp b/Source/WebKit/chromium/tests/CCHeadsUpDisplayTest.cpp
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+++ b/Source/WebKit/chromium/tests/CCHeadsUpDisplayTest.cpp
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "CCLayerTreeHost.h"
+#include "CCThreadedTest.h"
+#include "HeadsUpDisplayLayerChromium.h"
+#include "LayerChromium.h"
+
+using namespace WebCore;
+using namespace WebKitTests;
+
+namespace {
+
+class CCHeadsUpDisplayTest : public CCThreadedTest {
+protected:
+    virtual void initializeSettings(CCLayerTreeSettings& settings) OVERRIDE
+    {
+        // Enable the HUD without requiring text.
+        settings.showPropertyChangedRects = true;
+    }
+};
+
+class DrawsContentLayerChromium : public LayerChromium {
+public:
+    static PassRefPtr<DrawsContentLayerChromium> create() { return adoptRef(new DrawsContentLayerChromium()); }
+    virtual bool drawsContent() const OVERRIDE { return true; }
+
+private:
+    DrawsContentLayerChromium() : LayerChromium() { }
+};
+
+class CCHudWithRootLayerChange : public CCHeadsUpDisplayTest {
+public:
+    CCHudWithRootLayerChange()
+        : m_rootLayer1(DrawsContentLayerChromium::create())
+        , m_rootLayer2(DrawsContentLayerChromium::create())
+        , m_numCommits(0)
+    {
+    }
+
+    virtual void beginTest() OVERRIDE
+    {
+        m_rootLayer1->setBounds(IntSize(30, 30));
+        m_rootLayer2->setBounds(IntSize(30, 30));
+
+        postSetNeedsCommitToMainThread();
+    }
+
+    virtual void didCommit() OVERRIDE
+    {
+        ++m_numCommits;
+
+        ASSERT_TRUE(m_layerTreeHost->hudLayer());
+
+        switch (m_numCommits) {
+        case 1:
+            // Change directly to a new root layer.
+            m_layerTreeHost->setRootLayer(m_rootLayer1);
+            break;
+        case 2:
+            EXPECT_EQ(m_rootLayer1.get(), m_layerTreeHost->hudLayer()->parent());
+            // Unset the root layer.
+            m_layerTreeHost->setRootLayer(0);
+            break;
+        case 3:
+            EXPECT_EQ(0, m_layerTreeHost->hudLayer()->parent());
+            // Change back to the previous root layer.
+            m_layerTreeHost->setRootLayer(m_rootLayer1);
+            break;
+        case 4:
+            EXPECT_EQ(m_rootLayer1.get(), m_layerTreeHost->hudLayer()->parent());
+            // Unset the root layer.
+            m_layerTreeHost->setRootLayer(0);
+            break;
+        case 5:
+            EXPECT_EQ(0, m_layerTreeHost->hudLayer()->parent());
+            // Change to a new root layer from a null root.
+            m_layerTreeHost->setRootLayer(m_rootLayer2);
+            break;
+        case 6:
+            EXPECT_EQ(m_rootLayer2.get(), m_layerTreeHost->hudLayer()->parent());
+            // Change directly back to the last root layer/
+            m_layerTreeHost->setRootLayer(m_rootLayer1);
+            break;
+        case 7:
+            EXPECT_EQ(m_rootLayer1.get(), m_layerTreeHost->hudLayer()->parent());
+            endTest();
+            break;
+        }
+    }
+
+    virtual void afterTest() OVERRIDE
+    {
+    }
+
+private:
+    RefPtr<DrawsContentLayerChromium> m_rootLayer1;
+    RefPtr<DrawsContentLayerChromium> m_rootLayer2;
+    int m_numCommits;
+};
+
+TEST_F(CCHudWithRootLayerChange, runMultiThread)
+{
+    runTest(true);
+}
+
+} // namespace