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In RootView::DispatchGestureEvent(), use Event::Clone()
to copy gesture events prior to processing and perform
coordinate conversion of the events during targeting but
before dispatch (so the location of the gesture event
is in the coordinate space of the target).

In preparation for removing
RootView::DispatchGestureEvent(), also make the
corresponding changes to
EventProcessor::OnEventFromSource(). These changes
are necessary to ensure that located events will
be dispatched with their locations in the correct
coordinate space in all situations (in particular,
when an event is bubbling during an invocation of
nested event-processing).

BUG=411487
TEST=WidgetTest.GestureEventLocationWhileBubbling,
     ViewTargeterTest.GestureEventCoordinateConversion,
     modified ViewTargeterTest.ViewTargeterForGestureEvents

Review URL: https://codereview.chromium.org/542323002

Cr-Commit-Position: refs/heads/master@{#293797}