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This makes ui::Layer use cc::Layer::SetPosition for setting
its position, instead of baking its position into the
transform that's set on the cc::Layer. This means that a
change to a ui::Layer's bounds no longer affects the
transform set on the cc::Layer, and hence bounds animations
no longer conflict with threaded transform animations.

BUG=170219,226326


Review URL: https://chromiumcodereview.appspot.com/13725015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192659 0039d316-1c4b-4281-b951-d872f2087c98