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As each tiling iterator in raster and eviction queues iterates one
priority rect, those iterators know the priority rect for tiles. Thus
picture layer tilings compute priority rects only because iterators do
not pass that information to tilings. Therefore, unnecessary priority
rect computation can be avoided by passing priority rect information
from iterators to tilings.

Review URL: https://codereview.chromium.org/1126813002

Cr-Commit-Position: refs/heads/master@{#330061}