aura: Make 'ui' buildable without gtk.

ui/gfx/canvas_skia.h

 // 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.
 
 #ifndef UI_GFX_CANVAS_SKIA_H_
 #define UI_GFX_CANVAS_SKIA_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "skia/ext/platform_canvas.h"
 #include "ui/gfx/canvas.h"
 
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
+#if defined(TOOLKIT_USES_GTK)
 typedef struct _GdkPixbuf GdkPixbuf;
 #endif
 
 namespace gfx {
 
 class Canvas;
 
 // CanvasSkia is a SkCanvas subclass that provides a number of methods for
 // common operations used throughout an application built using base/gfx and
 // app/gfx.
@@ skipping 36 matching lines @@
 
   // Returns the default text alignment to be used when drawing text on a
   // gfx::CanvasSkia based on the directionality of the system locale language.
   // This function is used by gfx::Canvas::DrawStringInt when the text alignment
   // is not specified.
   //
   // This function returns either gfx::Canvas::TEXT_ALIGN_LEFT or
   // gfx::Canvas::TEXT_ALIGN_RIGHT.
   static int DefaultCanvasTextAlignment();
 
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
+#if defined(TOOLKIT_USES_GTK)
   // Draw the pixbuf in its natural size at (x, y).
   void DrawGdkPixbuf(GdkPixbuf* pixbuf, int x, int y);
 #endif
 
 #if defined(OS_WIN) || (defined(OS_POSIX) && !defined(OS_MACOSX))
   // Draws text with a 1-pixel halo around it of the given color.
   // On Windows, it allows ClearType to be drawn to an otherwise transparenct
   //   bitmap for drag images. Drag images have only 1-bit of transparency, so
   //   we don't do any fancy blurring.
   // On Linux, text with halo is created by stroking it with 2px |halo_color|
@@ skipping 96 matching lines @@
                      int x, int y, int w, int h,
                      int flags);
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(CanvasSkia);
 };
 
 }  // namespace gfx;
 
 #endif  // UI_GFX_CANVAS_SKIA_H_