Opt-in Polymer's usage counter to UKM

To analyze any popular sites that use Shadow DOM V0,
Custom Elements V0, HTML Imports APIs without
using Polymer's polyfill, use Polymer's counters
for excluding from those sites collected for
Shadow DOM V0, Custom Elements V0, HTML Imports API
raw usages.

Bug: 848153
Change-Id: I9ba3c70b06cd376157f3788e029373673bbcd1cd
Reviewed-on: https://chromium-review.googlesource.com/1127575
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Takayoshi Kochi <kochi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573227}
1 file changed