Use the sh namespace for shader variables.

Since these types originate from the translator, use an appropriate
namespace. Also rename some of the gl helper functions to be more
specific to their functionality.

BUG=angle:466

Change-Id: Idc29987b2053b3c40748dd46b581f3dbd8a6fd61
Reviewed-on: https://chromium-review.googlesource.com/204680
Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
22 files changed