gpu: Add support for GLX_EXT_texture_from_pixmap extension.

ui/gl/gl_image_stub.h

+// 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.
+
+#ifndef UI_GL_GL_IMAGE_STUB_H_
+#define UI_GL_GL_IMAGE_STUB_H_
+
+#include "ui/gl/gl_image.h"
+
+namespace gfx {
+
+// A GLImage that does nothing for unit tests.
+class GL_EXPORT GLImageStub : public GLImage {
+ public:
+  // Implement GLImage.
+  virtual void Destroy() OVERRIDE;
+  virtual gfx::Size GetSize() OVERRIDE;
+  virtual bool RebindPixmap(GLuint pixmap) OVERRIDE;
+
+ protected:
+  virtual ~GLImageStub();
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_GL_IMAGE_STUB_H_