Bug 1244546 part 1 - Apply proper unit conversion for SynthesizeNativeMouseEvent. r=karlt

MozReview-Commit-ID: 6XLzx7CyFEj

--HG--
extra : source : 5c61d059fc06b04456ab69c608d98e1e9433619d

widget/gtk/nsWindow.cpp

@@ -6823,7 +6823,8 @@ nsWindow::SynthesizeNativeMouseEvent(LayoutDeviceIntPoint aPoint,
     // aNativeMessage != GDK_BUTTON_RELEASE we'll synthesize a motion event
     // that will be emitted by gdk_display_warp_pointer().
     GdkScreen* screen = gdk_window_get_screen(mGdkWindow);
-    gdk_display_warp_pointer(display, screen, aPoint.x, aPoint.y);
+    GdkPoint point = DevicePixelsToGdkPointRoundDown(aPoint);
+    gdk_display_warp_pointer(display, screen, point.x, point.y);
   }
 
   return NS_OK;