Prelaunch GPU process after 10 seconds.
Prelaunch GPU process after 10 seconds.

This will happen if the --prelaunch-gpu-process command line switch is present or for 5% of users in a field trial.

This is so we can collect some stats of GPU capabilities.

TEST=try, check --prelaunch-gpu-process works
BUG=none

Review URL: http://codereview.chromium.org/3119002

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@55510 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