This is the renderer code for GLES1 that delivers basic vertex
attributes, matrices, and allows texturing for unit 0 only (more units
mean implementing the multitexturing pipeline).

+ Sample
+ Update test expectations for GLES1 conformance tests

BUG=angleproject:2306

Change-Id: Id5d5603c967e577290085e5946f2cb7a03d7e017
Reviewed-on: https://chromium-review.googlesource.com/1023988
Commit-Queue: Lingfeng Yang <lfy@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>