Implement UIEvent.sourceDevice

Source/core/events/InputDevice.cpp

Index: Source/core/events/InputDevice.cpp
diff --git a/Source/core/events/InputDevice.cpp b/Source/core/events/InputDevice.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4e61ff8c15543f0e2598c32dc7832470e3bb6896
--- /dev/null
+++ b/Source/core/events/InputDevice.cpp
@@ -0,0 +1,27 @@
+// 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.
+#include "config.h"
+#include "core/events/InputDevice.h"
+
+namespace blink {
+
+InputDevice::InputDevice()
+{
+    m_firesTouchEvents = false;
+}
+
+InputDevice::InputDevice(const InputDeviceInit& initializer)
+{
+    m_firesTouchEvents = initializer.firesTouchEvents();
+}
+
+InputDevice::~InputDevice()
+{
+}
+
+DEFINE_TRACE(InputDevice)
+{
+}
+
+} // namespace blink