Avoid div-by-zero in thumb quad computation
We used to have trouble when the max scroll offset was zero. With this cl we detect this case and set a reasonable scroll thumb offset. BUG=None Review URL: https://codereview.chromium.org/409193002 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284773 0039d316-1c4b-4281-b951-d872f2087c98
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