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diff --git a/Source/WebKit/chromium/tests/WebCompositorInputHandlerImplTest.cpp b/Source/WebKit/chromium/tests/WebCompositorInputHandlerImplTest.cpp
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+++ b/Source/WebKit/chromium/tests/WebCompositorInputHandlerImplTest.cpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2011 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 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 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 "WebCompositorInputHandlerImpl.h"
+
+#include "WebCompositor.h"
+#include "cc/CCSingleThreadProxy.h"
+
+#include <gtest/gtest.h>
+#include <wtf/OwnPtr.h>
+
+using WebKit::WebCompositorInputHandler;
+using WebKit::WebCompositorInputHandlerImpl;
+
+namespace {
+
+TEST(WebCompositorInputHandlerImpl, fromIdentifier)
+{
+    WebKit::WebCompositor::initialize(0);
+#ifndef NDEBUG
+    // WebCompositorInputHandler APIs can only be called from the compositor thread.
+    WebCore::DebugScopedSetImplThread alwaysImplThread;
+#endif
+
+    // Before creating any WebCompositorInputHandlers, lookups for any value should fail and not crash.
+    EXPECT_EQ(0, WebCompositorInputHandler::fromIdentifier(2));
+    EXPECT_EQ(0, WebCompositorInputHandler::fromIdentifier(0));
+    EXPECT_EQ(0, WebCompositorInputHandler::fromIdentifier(-1));
+
+    int compositorIdentifier = -1;
+    {
+        OwnPtr<WebCompositorInputHandlerImpl> comp = WebCompositorInputHandlerImpl::create(0);
+        compositorIdentifier = comp->identifier();
+        // The compositor we just created should be locatable.
+        EXPECT_EQ(comp.get(), WebCompositorInputHandler::fromIdentifier(compositorIdentifier));
+
+        // But nothing else.
+        EXPECT_EQ(0, WebCompositorInputHandler::fromIdentifier(comp->identifier() + 10));
+    }
+
+    // After the compositor is destroyed, its entry should be removed from the map.
+    EXPECT_EQ(0, WebCompositorInputHandler::fromIdentifier(compositorIdentifier));
+
+    WebKit::WebCompositor::shutdown();
+}
+
+}