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The context is allocated an id which is implicitly assumed to be 2
bytes, so it can be encoded in framebuffers/texture ids and used to
verify that textures used with a context are allocated by it.

This causes overflow issues with fuzzer runs, so wrap around the id once
it reaches the max value.

R=enne@chromium.org

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I10c799520be55a310ad90a4dfdb564f805cc3ce5
Reviewed-on: https://chromium-review.googlesource.com/1040878
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555965}