cc: Consider visible rect for update tile priority early out.

cc: Consider visible rect for update tile priority early out.

This patch adds a visible rect check for an early out from update
tile priorities.

The problem is that we can update tile priorities, then update
the visible rect in animation, and call update tile priorities
again. The second one would normally early out since it's called
in the same frame. This ensures the early out doesn't happen in
these cases.

BUG=423455
TBR=danakj, brianderson, enne

Review URL: https://codereview.chromium.org/667053003

Cr-Commit-Position: refs/heads/master@{#300526}
(cherry picked from commit cc0e08bd762154a6e31de5a2e3b2aa5b23af0eae)

Committed: https://chromium.googlesource.com/chromium/src/+/a383f3fe2e315340b92a25968269b749ee38097a

[vmpstr, 2014-10-27 23:59:25]

Committed patchset #1 (id:1) manually as
a383f3fe2e315340b92a25968269b749ee38097a (presubmit successful).