Schedule pings before frame loads in anchors.
Schedule pings before frame loads in anchors.

If scheduled afterwards, a prerender navigation may kill the renderer
before the ping goes through.

BUG=302816

Review URL: https://codereview.chromium.org/26312002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@159175 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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