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This CL teaches CheckNoGlError() in texture_upload_perftest.cc to
dump the GL error as human readable string.

Bug: 920626
Change-Id: I49c9ad3db9f343f0a031a7bce8505f99c6e4b832
Reviewed-on: https://chromium-review.googlesource.com/c/1440521
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Auto-Submit: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627040}