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This CL Adds two unit tests of ReverseGestureHandlerTest:

- OverviewReverseGestures to test the overview reverse
gestures.
- SwitchDesksReverseGestures to test the desk switching reverse
gestures.

Bug: 1107183

Change-Id: I2ea9304d637217330ecd0c16ab79a296eb8fedaf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419930
Commit-Queue: Xiaodan Zhu <zxdan@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809453}