ui: Move gesture-recognizer into ui/base/.

Moving the gesture-recognizer into ui/base/ makes it possible to be used by both
aura and views independently. This is the first step: add an interface for
touch-events and gesture-events so that the gesture recognizer does not have to
depend on aura or views events.

BUG=121744
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9958136

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@131023 0039d316-1c4b-4281-b951-d872f2087c98
33 files changed