This will allow them to be imported dynamically without name
mangling. This is necessary because sometimes SwiftShader
overrides libGLESv2 and libEGL, so we need to determine at
run-time if we are running with "actual" ANGLE.

BUG=466735

Change-Id: I396d717b79066feb8ed0d577ee7386b33eb1d160
Reviewed-on: https://chromium-review.googlesource.com/259954Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>