am 28333315: Merge "Added support for the GL_TEXTURE_EXTERNAL target" into gingerbread

Merge commit '28333315c6f62b303de2ec0ac9e48158ed419f06' into gingerbread-plus-aosp

* commit '28333315c6f62b303de2ec0ac9e48158ed419f06':
  Added support for the GL_TEXTURE_EXTERNAL target