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diff --git a/Source/WebCore/testing/MockGamepad.cpp b/Source/WebCore/testing/MockGamepad.cpp
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+++ b/Source/WebCore/testing/MockGamepad.cpp
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+/*
+ * Copyright (C) 2016 Apple 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 "MockGamepad.h"
+
+#if ENABLE(GAMEPAD)
+
+#include <wtf/CurrentTime.h>
+
+namespace WebCore {
+
+MockGamepad::MockGamepad(unsigned index, const String& gamepadID, unsigned axisCount, unsigned buttonCount)
+    : PlatformGamepad(index)
+{
+    m_connectTime = m_lastUpdateTime = monotonicallyIncreasingTime();
+    updateDetails(gamepadID, axisCount, buttonCount);
+}
+
+void MockGamepad::updateDetails(const String& gamepadID, unsigned axisCount, unsigned buttonCount)
+{
+    m_id = gamepadID;
+    m_axisValues = Vector<double>(axisCount, 0.0);
+    m_buttonValues = Vector<double>(buttonCount, 0.0);
+    m_lastUpdateTime = monotonicallyIncreasingTime();
+}
+
+bool MockGamepad::setAxisValue(unsigned index, double value)
+{
+    if (index >= m_axisValues.size()) {
+        LOG_ERROR("MockGamepad (%u): Attempt to set value on axis %u which doesn't exist", m_index, index);
+        return false;
+    }
+
+    m_axisValues[index] = value;
+    m_lastUpdateTime = monotonicallyIncreasingTime();
+    return true;
+}
+
+bool MockGamepad::setButtonValue(unsigned index, double value)
+{
+    if (index >= m_buttonValues.size()) {
+        LOG_ERROR("MockGamepad (%u): Attempt to set value on button %u which doesn't exist", m_index, index);
+        return false;
+    }
+
+    m_buttonValues[index] = value;
+    m_lastUpdateTime = monotonicallyIncreasingTime();
+    return true;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(GAMEPAD)