GTTF: Increase the limit for QPC drift.
GTTF: Increase the limit for QPC drift.

Also update the DCHECK to use an absolute
value of the skew for comparison. It could
be negative.

TEST=base_unittests
BUG=none

Review URL: http://codereview.chromium.org/3083002

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@54191 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser