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If we lose our context (or potentially in rare OOM cases), gpu::buffer
allocation can fail. In these cases the discardable system shouldn't
crash, but should fail gracefully.

Bug: 762645
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I9d56536fd21893689ef993a68ee2a5639947e612
Reviewed-on: https://chromium-review.googlesource.com/782647Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519763}