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This is preperatory work which will allow for cheaper update of the
req'd for activation/draw status in the client side scheduler work.

BUG=673434
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2564433003
Cr-Commit-Position: refs/heads/master@{#437990}