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For Exo windows, the initial gesture target is set to an ExoSurface. If
the client (Android) requests a drag-move or drag-resize, then Exo calls
AttemptToStartDrag, and provides the ExoShellSurface as the target.
Then, ToplevelWindowEventHandler will transfer the events to the new
target. However, WmToplevelWindowEventHandler won't update the gesture
target. This means all events will be ignored later in
WmToplevelWindowEventHandler::OnGestureEvent because it believes they
are events for the client which need to not be delivered.

Bug: b/124026845
Test: Drag-to-move via touch of a PIP window no longer lags.
Change-Id: I6e7bca73561fdab1bf357dd86de2a5d4e9a4bddc
Reviewed-on: https://chromium-review.googlesource.com/c/1477452Reviewed-by: Eliot Courtney <edcourtney@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634401}