Trac #20875
Signed-off-by: Nicolas Capens

TexImage2D accepts
  format,internalformat=DEPTH_COMPONENT, type=UNSIGNED_SHORT
  format,internalformat=DEPTH_COMPONENT, type=UNSIGNED_INT
  format,internalformat=DEPTH_STENCIL_OES, type=UNSIGNED_INT_24_8_OES

TexSubImage2D accepts
  format=DEPTH_COMPONENT, type=UNSIGNED_SHORT
  format=DEPTH_COMPONENT, type=UNSIGNED_INT
  format=DEPTH_STENCIL_OES, type=UNSIGNED_INT_24_8_OES

TexStorage2DEXT accepts
  internalformat=DEPTH_COMPONENT16
  internalformat=DEPTH_COMPONENT32_OES
  internalformat=DEPTH24_STENCIL8_OES

git-svn-id: https://angleproject.googlecode.com/svn/trunk@1104 736b8ea6-26fd-11df-bfd4-992fa37f6226