GitLab

This patch allows WebGPU to allocate command space up to the
transfer buffer size instead of being limited to the initial
starting transfer buffer size.

This patch also creates SharedMemoryLimits::ForWebGPUContext(). Because
WebGPU sends the majority of its commands via the transfer buffer, it is
preferrable to have a larger minimum transfer buffer size and smaller
command buffer.

Change-Id: I31bb74dfb1075a2b6f159985b297695d57e71ed3
Bug: 877147
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559455
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649744}