Add support for more depth buffer formats in our EGLConfigs. This includes no depth buffer and 16-bit depth buffer with no stencil buffer. TRAC #22496 Signed-off-by: Geoff Lang Signed-off-by: Shannon Woods Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1851 736b8ea6-26fd-11df-bfd4-992fa37f6226