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A DCHECK became invalid after a recent refactoring. Move the DCHECK to
more appropriate place.
BeginReadAccess() could be called multiple times on a single shared
image in which case this DCHECK is valid only for the first call. once
|promise_texture_| is created and cached, this DCHECK becomes invalid.

Change-Id: Ia77759ca7797675adbcf41a78c1086e3aebba2a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822318Reviewed-by: Eric Karl <ericrk@chromium.org>
Commit-Queue: vikas soni <vikassoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699903}