Change when GESTURE_BEGIN and GESTURE_END events are dispatched to views
No longer dispatch ui::ET_GESTURE_BEGIN events
to views, as the dispatch of ui::ET_GESTURE_TAP_DOWN
is sufficient to represent the start of a gesture
sequence for the first touch point. Furthermore,
only dispatch the ui::ET_GESTURE_END corresponding
to the removal of the last touch point.
BUG=397564
TEST=RootViewTest.ContextMenuFromLongPress,
WidgetTestInteractive.ResetCaptureOnGestureEnd,
WidgetTest.EventHandlersOnRootView,
WidgetTest.GestureBeginAndEndEvents
Review URL: https://codereview.chromium.org/
425583002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@286523 0039d316-1c4b-4281-b951-d872f2087c98