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Add convenience link for sheriffs to easily access size bugs.

Bug: None
Change-Id: I04e9ad3041c49cdfa0e0d0e78ca1f5cd0e7cab66
Reviewed-on: https://chromium-review.googlesource.com/1107848Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568840}