Add Vector2d classes that represent offsets, instead of using Point.

ui/base/dragdrop/drag_utils_gtk.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/dragdrop/drag_utils.h"
 
 #include <gtk/gtk.h>
 
 #include "base/logging.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/dragdrop/os_exchange_data_provider_gtk.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/gtk_util.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/size.h"
 
 namespace drag_utils {
 
 void SetDragImageOnDataObject(const gfx::ImageSkia& image_skia,
                               const gfx::Size& size,
-                              const gfx::Point& cursor_offset,
+                              const gfx::Vector2d& cursor_offset,
                               ui::OSExchangeData* data_object) {
   ui::OSExchangeDataProviderGtk& provider(
       static_cast<ui::OSExchangeDataProviderGtk&>(data_object->provider()));
 
   // Convert the image into a GdkPixbuf.
   GdkPixbuf* canvas_pixbuf = gfx::GdkPixbufFromSkBitmap(image_skia.bitmap());
 
   // Make a new pixbuf of the requested size and copy it over.
   GdkPixbuf* pixbuf = gdk_pixbuf_new(
       gdk_pixbuf_get_colorspace(canvas_pixbuf),
       gdk_pixbuf_get_has_alpha(canvas_pixbuf),
       gdk_pixbuf_get_bits_per_sample(canvas_pixbuf),
       size.width(),
       size.height());
   gdk_pixbuf_copy_area(canvas_pixbuf, 0, 0, size.width(), size.height(), pixbuf,
                        0, 0);
   g_object_unref(canvas_pixbuf);
 
   // Set the drag data on to the provider.
   provider.SetDragImage(pixbuf, cursor_offset);
   g_object_unref(pixbuf);
 }
 
 }  // namespace drag_utils