Removed some extra overloads of TextureStorage::getRenderTarget and added a method to get the render target of a Texture3D layer. TRAC #22705 Signed-off-by: Jamie Madill Signed-off-by: Shannon Woods Author: Geoff Lang git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2164 736b8ea6-26fd-11df-bfd4-992fa37f6226