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We only print bindings in DEBUG build. However, we generate code for
printing bindings in release build for each new binding we create.
This CL simply hides all printing related code behind DEBUG build. It
reduces the native binary size about 20k.

Bug: NONE
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr
Change-Id: Ie6b6c6148369717b89c1e4f68336c0950954cc06
Reviewed-on: https://chromium-review.googlesource.com/1076308
Commit-Queue: Biao She <bshe@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562556}