Enable high resolution time for TimeTicks::Now on Windows Canary

This should be unnoticeable, except for improved resolution in places such as window.performance.now().

The feature is enabled if the user is running Canary channel or has manually specified the --enable-high-resolution-time flag. This will only work if the CPU has a non-stop TSC and isn't a broken Athlon processor. UMA data show this is a safe combination.

The flag is propagated to renderer processes so that they know to enable it too.

BUG=158234

Review URL: https://chromiumcodereview.appspot.com/16896018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@217172 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed