Implement dragging icon for dragging bookmarks in views/gtk.

views/drag_utils_gtk.cc

Index: views/drag_utils_gtk.cc
===================================================================
--- views/drag_utils_gtk.cc	(revision 28576)
+++ views/drag_utils_gtk.cc	(working copy)
@@ -4,9 +4,13 @@
 
 #include "views/drag_utils.h"
 
+#include <gtk/gtk.h>
+
 #include "app/gfx/canvas.h"
+#include "app/gfx/gtk_util.h"
 #include "base/logging.h"
 #include "app/os_exchange_data.h"
+#include "app/os_exchange_data_provider_gtk.h"
 
 namespace drag_utils {
 
@@ -16,7 +20,26 @@
                               int cursor_x_offset,
                               int cursor_y_offset,
                               OSExchangeData* data_object) {
-  NOTIMPLEMENTED();
+  OSExchangeDataProviderGtk& provider(
+      static_cast<OSExchangeDataProviderGtk&>(data_object->provider()));
+
+  // Convert the canvas into a GdkPixbuf.
+  SkBitmap bitmap = canvas.ExtractBitmap();
+  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),
+      width,
+      height);
+  gdk_pixbuf_copy_area(canvas_pixbuf, 0, 0, width, height, pixbuf, 0, 0);
+  g_object_unref(canvas_pixbuf);
+
+  // Set the drag data on to the provider.
+  provider.SetDragImage(pixbuf, cursor_x_offset, cursor_y_offset);
+  g_object_unref(pixbuf);
 }
 
 } // namespace drag_utils