Bug 1519106 - Converge towards the max number of tiles faster. r=kats
Bug 1519106 - Converge towards the max number of tiles faster. r=kats

Differential Revision: https://phabricator.services.mozilla.com/D27728

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/902bff64318d963ea1d5505eebd0f66b11d55f28

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender