Fix thread traits for CSD TfLite model

This CL fixes the TaskTraits for the task running the CSD TfLite model,
eliminating a crash due to Skia relying on //base sync primitives. It
also adds a few TfLite ops that were not in the original model.

Bug: 1225442
Change-Id: If3c06960ca75e99f7fdf11091a2528926a4653ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2998793


Reviewed-by: Xinghui Lu <xinghuilu@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#899192}