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Several files in gpu/command_buffer/service use local SHADER
macros. If they are compiled together in a jumbo build those
macros will collide and prevent the compilation.

This patch undefs the macros after use. An alternative is to
give them unique names.

Bug: 864986
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
Change-Id: I9de4011e1d609e5658a9d6cbe1775a3146364fa1
Reviewed-on: https://chromium-review.googlesource.com/1143265Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#577044}