After http://trac.webkit.org/changeset/20780, when MouseEvent is constructed, it must have a button…

Source/WebKit/chromium/tests/WebInputEventConversionTest.cpp

Index: Source/WebKit/chromium/tests/WebInputEventConversionTest.cpp
diff --git a/Source/WebKit/chromium/tests/WebInputEventConversionTest.cpp b/Source/WebKit/chromium/tests/WebInputEventConversionTest.cpp
index 82892a03a49f637d0ebfb16c505d7b55157cc4cb..4ce43ab39feea0934d48645ebbca1c659f85b454 100644
--- a/Source/WebKit/chromium/tests/WebInputEventConversionTest.cpp
+++ b/Source/WebKit/chromium/tests/WebInputEventConversionTest.cpp
@@ -232,6 +232,13 @@ TEST(WebInputEventConversionTest, InputEventsScaling)
     }
 
     {
+        PlatformMouseEvent platformMouseEvent(IntPoint(10, 10), IntPoint(10, 10), NoButton, PlatformEvent::MouseMoved, 1, false, false, false, false, 0);
+        RefPtr<MouseEvent> mouseEvent = MouseEvent::create(WebCore::eventNames().mousemoveEvent, domWindow, platformMouseEvent, 0, document);
+        WebMouseEventBuilder webMouseBuilder(view, docRenderer, *mouseEvent);
+        EXPECT_EQ(WebMouseEvent::ButtonNone, webMouseBuilder.button);
+    }
+
+    {
         PlatformGestureEvent platformGestureEvent(PlatformEvent::GestureScrollUpdate, IntPoint(10, 10), IntPoint(10, 10), 0, IntSize(10, 10), FloatPoint(10, 10), false, false, false, false);
         RefPtr<GestureEvent> gestureEvent = GestureEvent::create(domWindow, platformGestureEvent);
         WebGestureEventBuilder webGestureBuilder(view, docRenderer, *gestureEvent);