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To enable these metrics on UKM dashboard.

Bug: 1068642
Change-Id: I497e6bfe703407a9a6d42f68a546d2117c8f0058
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151335
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761059}