Cache the GdkSkia object in PlatformContextSkia so that we aren't creating

webkit/port/platform/graphics/skia/GdkSkia.h

+/* Based on GTK code by the Chromium Authors. The original header for that code
+ * continues below */
+
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/*
+ * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
+ * file for a list of people on the GTK+ Team.  See the ChangeLog
+ * files for a list of changes.  These files are distributed with
+ * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
+ */
+
+#ifndef __GDK_SKIA_H__
+#define __GDK_SKIA_H__
+
+#include <gdk/gdk.h>
+#include <cairo/cairo.h>
+
+class SkCanvas;
+
+G_BEGIN_DECLS
+
+typedef struct _GdkSkiaObject GdkSkiaObject;
+typedef struct _GdkSkiaObjectClass GdkSkiaObjectClass;
+
+typedef struct _GdkDrawable GdkSkia;
+
+#define GDK_TYPE_SKIA              (gdk_skia_get_type ())
+#define GDK_SKIA(object)           (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_SKIA, GdkSkia))
+#define GDK_SKIA_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_SKIA, GdkSkiaObjectClass))
+#define GDK_IS_SKIA(object)        (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_SKIA))
+#define GDK_IS_SKIA_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_SKIA))
+#define GDK_SKIA_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_SKIA, GdkSkiaObjectClass))
+#define GDK_SKIA_OBJECT(object)    ((GdkSkiaObject *) GDK_SKIA (object))
+
+struct _GdkSkiaObject
+{
+  GdkDrawable parent_instance;
+  SkCanvas *canvas;
+  cairo_surface_t *surface;
+};
+
+struct _GdkSkiaObjectClass
+{
+  GdkDrawableClass parent_class;
+};
+
+GType gdk_skia_get_type();
+
+// -----------------------------------------------------------------------------
+// Return a new GdkSkia for the given canvas.
+// -----------------------------------------------------------------------------
+GdkSkia* gdk_skia_new(SkCanvas* canvas);
+
+G_END_DECLS
+
+#endif /* __GDK_SKIA_H__ */