GitLab

leaving already-called-callbacks in the input_buffer_queue_ was causing
crashes when they were called a second time.



Bug: 889375
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: I6623f6736aa0551253a23282562721facf06acf0
Reviewed-on: https://chromium-review.googlesource.com/1247421Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594575}