Ensure that the drag image during drag drop operations on Windows is of the correct scale.

ui/base/dragdrop/drag_utils_win.cc

Index: ui/base/dragdrop/drag_utils_win.cc
diff --git a/ui/base/dragdrop/drag_utils_win.cc b/ui/base/dragdrop/drag_utils_win.cc
index 9fedd4202a34ac8e32614fd9de5b9d15a07b8407..212ae21cd4ff48164b9f1a19cf401d3170a2d58f 100644
--- a/ui/base/dragdrop/drag_utils_win.cc
+++ b/ui/base/dragdrop/drag_utils_win.cc
@@ -18,6 +18,7 @@
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/skbitmap_operations.h"
+#include "ui/gfx/win/dpi.h"
 
 namespace drag_utils {
 
@@ -61,11 +62,16 @@ void SetDragImageOnDataObject(const gfx::ImageSkia& image_skia,
                               const gfx::Vector2d& cursor_offset,

[sky, 2015/11/25 23:38:43]

I suspect you need to adjust cursor_offset too.

[ananta, 2015/12/01 02:42:28]

Done.

                               ui::OSExchangeData* data_object) {
   DCHECK(data_object && !image_skia.size().IsEmpty());
+
+  // Attempt to find a bitmap closely matching the current dpi scale.
+  gfx::ImageSkiaRep image_rep_for_scale = image_skia.GetRepresentation(
+      gfx::GetDPIScale());
+
   // InitializeFromBitmap() doesn't expect an alpha channel and is confused
   // by premultiplied colors, so unpremultiply the bitmap.
   // SetDragImageOnDataObject(HBITMAP) takes ownership of the bitmap.
-  HBITMAP bitmap = CreateHBITMAPFromSkBitmap(
-      SkBitmapOperations::UnPreMultiply(*image_skia.bitmap()));
+  HBITMAP bitmap = CreateHBITMAPFromSkBitmap(SkBitmapOperations::UnPreMultiply(
+      image_rep_for_scale.sk_bitmap()));
   if (bitmap) {
     // Attach 'bitmap' to the data_object.
     SetDragImageOnDataObject(