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Also, when we cleanup tilings on the active twin, we use the pending
twin's ideal contents scale. But when the twin !CanHavTilings() there
is no need to use that ideal scale and save tilings.

R=enne@chromium.org, enne

Review URL: https://codereview.chromium.org/334953003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278219 0039d316-1c4b-4281-b951-d872f2087c98