Skip autosizing if the multiplier will be 1 for all clusters.
Skip autosizing if the multiplier will be 1 for all clusters.

BUG=

Review URL: https://codereview.chromium.org/53373004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@161391 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs