overview gesture: Make |window_values| in ScopedWindowModifier optional.
|window_values| is not needed for kDragWindowToHomeOrOverview case. Bug: 997885 Change-Id: I950d62a53421ccf91c20d73c54c76c71689fbeff Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825479 Commit-Queue: Xiaoqian Dai <xdai@chromium.org> Reviewed-by:Xiyuan Xia <xiyuan@chromium.org> Cr-Commit-Position: refs/heads/master@{#700362}
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