Populates sourceDevice attribute into MouseEvent

Source/core/events/UIEvent.cpp

Index: Source/core/events/UIEvent.cpp
diff --git a/Source/core/events/UIEvent.cpp b/Source/core/events/UIEvent.cpp
index 7ec400e78f1de72f1d93e1205ad904e35e69bd1a..d68ad06588c3117e6b1880fd03b276d31698f072 100644
--- a/Source/core/events/UIEvent.cpp
+++ b/Source/core/events/UIEvent.cpp
@@ -53,7 +53,7 @@ UIEvent::~UIEvent()
 {
 }
 
-void UIEvent::initUIEvent(const AtomicString& typeArg, bool canBubbleArg, bool cancelableArg, PassRefPtrWillBeRawPtr<AbstractView> viewArg, int detailArg)
+void UIEvent::initUIEvent(const AtomicString& typeArg, bool canBubbleArg, bool cancelableArg, PassRefPtrWillBeRawPtr<AbstractView> viewArg, int detailArg, InputDevice* sourceDevice)
 {
     if (dispatched())
         return;
@@ -62,7 +62,12 @@ void UIEvent::initUIEvent(const AtomicString& typeArg, bool canBubbleArg, bool c
 
     m_view = viewArg;
     m_detail = detailArg;
-    m_sourceDevice = nullptr;
+    m_sourceDevice = sourceDevice;
+}
+
+void UIEvent::initUIEvent(const AtomicString& typeArg, bool canBubbleArg, bool cancelableArg, PassRefPtrWillBeRawPtr<AbstractView> viewArg, int detailArg)
+{
+    initUIEvent(typeArg, canBubbleArg, cancelableArg, viewArg, detailArg, nullptr);
 }
 
 bool UIEvent::isUIEvent() const