Use ui::Event in ui/events/gesture_detection.

This is the first step towards merging GestureEventData
and GestureEventDetails.

BUG=348577
TEST=TouchDispositionGestureFilterTest.*

Review URL: https://codereview.chromium.org/184103018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254831 0039d316-1c4b-4281-b951-d872f2087c98
Temporarly enable portal notification by default.

BUG=240237
TEST=manual tests on Lumpy

Review URL: https://codereview.chromium.org/185233013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254832 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254832