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The passthrough command decoder uses robust buffer access behaviour. This
makes OOB error checks unimportant because OOB accesses will not cause
errors. OOB accesses will also return implementation-dependent values.
See the KHR_robust_buffer_access_behavior spec for more information.

This will allow ANGLE to selectively disable range checking when robust
buffer access behaviour is enabled. This applies to DrawArrays calls
only. DrawElements already had the robust buffer access check instated.

Bug: angleproject:3000
Change-Id: I3bf5f694d740025a9c40142bb5b0a7801489a70a
Reviewed-on: https://chromium-review.googlesource.com/c/1396298Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619996}