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This adds a new IDR resource id, to decouple the shown-icon from any
icon asset that gets brought in via DEPS.

Bug: b/150637102
Change-Id: I55b98e9fe7cf0d3fde4a87661d9dfbd39dc12ea7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120661
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Patti <patricialor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753538}