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This CL enforces that the target surface for touch events is always the
root surface for ClientControlledShellSurface.

ARC currently disables input for all sub-surfaces such that the target
surface is always the root surface. Newer clients will use a surface
hierarchy consistent with upstream Wayland, so focus will move between
different surfaces. This CL prevents touch events from being discarded
when capture changes during dragging/resizing, as a stopgap until
server-driven dragging/resizing is implemented.

Bug: b:67384524
Test: Input still works in ARC.
Change-Id: I3b419ec14cc04432b5b92618ed45df441da0d8eb
Reviewed-on: https://chromium-review.googlesource.com/812980
Commit-Queue: Dominik Laskowski <domlaskowski@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524259}