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This changes enables us to set number of threads used by TFLite
predictor and measure performance at various scenarios.

Bug: 1115689
Change-Id: Ib5b0a1315fb426851e0b8d54f6e43128e3303877
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352213Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Mehrdad Hessar <mehrdadh@google.com>
Cr-Commit-Position: refs/heads/master@{#797855}