Move most of ui/views/drag_utils to ui/base/dragdrop so it can be used outside of views. I tried to…

ui/views/drag_utils_gtk.cc

-// Copyright (c) 2011 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/views/drag_utils.h"
-
-#include <gtk/gtk.h>
-
-#include "base/logging.h"
-#include "third_party/skia/include/core/SkBitmap.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/point.h"
-#include "ui/gfx/size.h"
-
-namespace drag_utils {
-
-void SetDragImageOnDataObject(const SkBitmap& bitmap,
-                              const gfx::Size& size,
-                              const gfx::Point& cursor_offset,
-                              ui::OSExchangeData* data_object) {
-  ui::OSExchangeDataProviderGtk& provider(
-      static_cast<ui::OSExchangeDataProviderGtk&>(data_object->provider()));
-
-  // Convert the bitmap into a GdkPixbuf.
-  GdkPixbuf* canvas_pixbuf = gfx::GdkPixbufFromSkBitmap(&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