Populates sourceDevice attribute into TouchEvent

Source/core/input/InputDevice.cpp

Index: Source/core/input/InputDevice.cpp
diff --git a/Source/core/input/InputDevice.cpp b/Source/core/input/InputDevice.cpp
index 927a99c2a8ae068f6c77990e51671edd9e94ece9..6121c1908c84903aaaafded9e8cd9607b2ebf87a 100644
--- a/Source/core/input/InputDevice.cpp
+++ b/Source/core/input/InputDevice.cpp
@@ -21,4 +21,16 @@ InputDevice::~InputDevice()
 {
 }
 
+InputDevice* InputDevice::touchEventInstance()
+{
+    DEFINE_STATIC_LOCAL(InputDevice, instance, (true));
+    return &instance;
+}
+
+InputDevice* InputDevice::nonTouchEventInstance()
+{
+    DEFINE_STATIC_LOCAL(InputDevice, instance, (false));
+    return &instance;
+}
+
 } // namespace blink