Scale the location of drag image for high DPI

ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h

Index: ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h
diff --git a/ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h b/ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h
index 9fec7bbe020b2d6ea9029ed17780b88369fabed5..07481288eb3aed6738ef4670f7ca8d28d3293f84 100644
--- a/ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h
+++ b/ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h
@@ -19,6 +19,7 @@
 #include "ui/base/cursor/cursor.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/gfx/geometry/point.h"
+#include "ui/gfx/geometry/size.h"
 #include "ui/gfx/x/x11_atom_cache.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/desktop_aura/x11_move_loop_delegate.h"
@@ -118,6 +119,9 @@ class VIEWS_EXPORT DesktopDragDropClientAuraX11
   // server.
   virtual void SendXClientEvent(::Window xid, XEvent* xev);
 
+ protected:
+  Widget* drag_widget() { return drag_widget_.get(); }
+
  private:
   enum SourceState {
     // |source_current_window_| will receive a drop once we receive an
@@ -278,6 +282,9 @@ class VIEWS_EXPORT DesktopDragDropClientAuraX11
   // Widget that the user drags around. May be NULL.
   std::unique_ptr<Widget> drag_widget_;
 
+  // The size of drag image.
+  gfx::Size drag_image_size_;
+
   // The offset of |drag_widget_| relative to the mouse position.
   gfx::Vector2d drag_widget_offset_;