Make GL calls go through subclassable class.

ui/gl/gl_osmesa_api_implementation.h

Index: ui/gl/gl_osmesa_api_implementation.h
diff --git a/ui/gl/gl_osmesa_api_implementation.h b/ui/gl/gl_osmesa_api_implementation.h
new file mode 100644
index 0000000000000000000000000000000000000000..95271f41238bcb42ac0611695b77df8390853724
--- /dev/null
+++ b/ui/gl/gl_osmesa_api_implementation.h
@@ -0,0 +1,40 @@
+// 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_OSMESA_API_IMPLEMENTATION_H_
+#define UI_GL_OSMESA_API_IMPLEMENTATION_H_
+
+#include "base/compiler_specific.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_export.h"
+
+namespace gfx {
+
+class GLContext;
+
+void InitializeGLBindingsOSMESA();
+void InitializeGLExtensionBindingsOSMESA(GLContext* context);
+void InitializeDebugGLBindingsOSMESA();
+void ClearGLBindingsOSMESA();
+
+class GL_EXPORT RealOSMESAApi : public OSMESAApi {
+ public:
+  RealOSMESAApi();
+  void Initialize(DriverOSMESA* driver);
+
+  // Include the auto-generated part of this class. We split this because
+  // it means we can easily edit the non-auto generated parts right here in
+  // this file instead of having to edit some template or the code generator.
+  #include "gl_bindings_api_autogen_osmesa.h"
+
+ private:
+  DriverOSMESA* driver_;
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_OSMESA_API_IMPLEMENTATION_H_
+
+
+