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

content/browser/web_contents/web_drag_source_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 "content/browser/web_contents/web_drag_source_gtk.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/nix/mime_util_xdg.h"
@@ skipping 57 matching lines @@
   }
 
   gtk_widget_destroy(drag_widget_);
   gtk_widget_destroy(drag_icon_);
 }
 
 void WebDragSourceGtk::StartDragging(const WebDropData& drop_data,
                                      WebDragOperationsMask allowed_ops,
                                      GdkEventButton* last_mouse_down,
                                      const SkBitmap& image,
-                                     const gfx::Point& image_offset) {
+                                     const gfx::Vector2d& image_offset) {
   // Guard against re-starting before previous drag completed.
   if (drag_context_) {
     NOTREACHED();
     web_contents_->SystemDragEnded();
     return;
   }
 
   int targets_mask = 0;
 
   if (!drop_data.text.string().empty())
@@ skipping 314 matching lines @@
   cairo_clip(cr);
   cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
   gdk_cairo_set_source_pixbuf(cr, drag_pixbuf_, 0, 0);
   cairo_paint(cr);
   cairo_destroy(cr);
 
   return TRUE;
 }
 
 }  // namespace content