Increase the time window to 1 second for Typing Detection.

BUG=264611

Review URL: https://codereview.chromium.org/200223002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257091 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 257091