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Under certain circumstances, we may try to render quads with missing
resources in GLRenderer. Currently, this leads to a crash.

This change causes us to handle this more gracefully (skip drawing
these quads) rather than crashing. This is a temporary fix until we
figure out why these resources are missing in the first place.

Bug: 811858
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Ie01891f7816f7797178a63989b301ad276984671
Reviewed-on: https://chromium-review.googlesource.com/920145Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546039}