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This sets up the plumbing to get data from the Task Scheduler to the
internals page. The first target are some selected histograms.

BUG=553459
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://chromiumcodereview.appspot.com/2420973002
Cr-Commit-Position: refs/heads/master@{#426520}