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The Rtree should already have avoided any items which don't intersect
with what we want to raster.

There may be scenarios where rejecting from the cull rect produces
slightly better results because of rounding while constructing the
visual rect, but these are extreme corner cases along tile boundaries
and should be rare, and not worth the extra overhead for the common
case, as demonstrated by the perf results.

R=wkorman@chromium.org

Bug: 671433
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I1556d618fa2d276525787fb903bdfa2d5aba653d
Reviewed-on: https://chromium-review.googlesource.com/506519
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#474014}