add cogl-glsl-shader files to aid backporting patches

To aid with backporting patches from master made after the deprecated
CoglShader api was removed this patch adds the cogl-glsl- files that
have been added on master so we should get less conflicts when cherry
picking.

cogl/cogl-glsl-shader-private.h

@@ -0,0 +1,35 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2012 Intel Corporation.
+ *
+ * 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, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _COGL_GLSL_SHADER_PRIVATE_H_
+#define _COGL_GLSL_SHADER_PRIVATE_H_
+
+void
+_cogl_glsl_shader_set_source_with_boilerplate (CoglContext *ctx,
+                                               GLuint shader_gl_handle,
+                                               GLenum shader_gl_type,
+                                               int n_tex_coord_attribs,
+                                               GLsizei count_in,
+                                               const char **strings_in,
+                                               const GLint *lengths_in);
+
+#endif /* _COGL_GLSL_SHADER_PRIVATE_H_ */