Add Monorail component to blink_perf.image_decoder

The blink_perf.image_decoder perf test is missing its Monorail
component. This CL adds it.

BUG=872828

Change-Id: Ie095d0bced3bb18474024010cb76b588fe43be3c
Reviewed-on: https://chromium-review.googlesource.com/c/1278630
Commit-Queue: Chris Blume <cblume@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#599542}
2 files changed