GitLab

Clean up some code in the GesturePoint to provide centralized
access to the scroll deltas so that smoothing of scroll start
is easier to implement.

BUG=141653


Review URL: https://chromiumcodereview.appspot.com/11415293

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171116 0039d316-1c4b-4281-b951-d872f2087c98