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This gives the image button a pressed state provided by the system.

Bug: 848879
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I8912e4cf438a57f27bf432ccb0b1bec10146672c
Reviewed-on: https://chromium-review.googlesource.com/1182669Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584741}