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Currently, ImmersiveGestureHandlerClassic installs itself as a pretarget
handler on Shell. This is necessary to get events from bezel sensors,
which have bounds outside the immersive fs window. It also forwards
gesture events to ImmersiveFullscreenController.

Keep the part of ImmersiveGestureHandlerClassic that handles drag-
triggering gesture events in tablet mode (i.e. most of the class) and
run that within Ash in both Classic and Mash configurations.

Make ImmersiveFullscreenController a pretarget handler for the toplevel
window when it's in immersive mode. This works in either Ash or client
as ImmersiveFullscreenController doesn't need to get events outside of
the window's bounds. ImmersiveFullscreenController is now both an
EventHandler (for gesture events) and an EventObserver (for mouse and
touch events).

Bug: 624157,640374
Change-Id: I83536cb407b4ac890db63d4c6a0fe98b7912a3f4
Reviewed-on: https://chromium-review.googlesource.com/c/1300678
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605733}