Disable boot animation on slow hardware.
Disable boot animation on slow hardware.

BUG=chromium:131193
TEST=Manual. On Alex machine wallpaper is loaded async.

Change-Id: Ia677c7322e0f1f7f854a4e405b51abef408340fb
Reviewed-on: https://gerrit.chromium.org/gerrit/29764
Tested-by: Nikita Kostylev <7857529256a44a19ab255c252a5ff27839cf3c91@chromium.org>
Reviewed-by: Richard Barnette <9e7d66387742bf40b0d2548ef2b93e7c522ca0eb@chromium.org>
Commit-Ready: Nikita Kostylev <7857529256a44a19ab255c252a5ff27839cf3c91@chromium.org>

chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager