In order to work with tools which intercept EGL and GLES calls.

BUG=angleproject:2343

Change-Id: I63aec7a56648dc4b3e7f4aff7f7d1608709ba118
Reviewed-on: https://chromium-review.googlesource.com/920652
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>