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hayato@chromium.org authored
This CL also introduces a new UseCounter, ElementCreateShadowRootMultipleWithUserAgentShadwoRoot, to measure the usage separately. BUG=489947 Review URL: https://codereview.chromium.org/1159563012 git-svn-id: svn://svn.chromium.org/blink/trunk@196057 bbb929c8-8fbe-4397-9dbb-9b2b20218538
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