//tools/perf: Really schedule image decoder benchmark

The previous CL (https://chromium-review.googlesource.com/#/c/663837/)
only assigned this benchmark to certain bots. I forgot to actually
schedule it by un-disabling it. This CL does that.

Bug: 762468
Change-Id: Ic6d094fab55ab781dda5a89d833bb52ee326e120
Reviewed-on: https://chromium-review.googlesource.com/665382
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#501797}
4 files changed