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This patch removes vectors from the eviction tile
iterator at the layer level. It reworks the code
a bit to use the underlying layer's tilings
directly using indecies and ranges, instead of
constructing a separate vector to hold the
values.

As well, this ensures that the iterators
are only created when they are visited.


R=reveman

Review URL: https://codereview.chromium.org/428533008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287688 0039d316-1c4b-4281-b951-d872f2087c98