Measure the usage of prefixed Shadow DOM APIs. BUG=242153 R=hayato@chromium.org Review URL: https://chromiumcodereview.appspot.com/20249002 git-svn-id: svn://svn.chromium.org/blink/trunk@154901 bbb929c8-8fbe-4397-9dbb-9b2b20218538 Source/core/dom/Element.idl[diff]Source/core/page/UseCounter.h[diff]
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