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In current code, we have no constraints on gesture event's location.
As result, when window is dragged by touch-gestures to the edge of display,
gesture's location may be in a wrong display. It will lead to system crash.
In this CL, constraint on gesture event's location is added

Change-Id: I2c03d369df0b7bed143edb3f04a9c7aad5968d4a
Test: ash_unittests
Bug: 917060
Reviewed-on: https://chromium-review.googlesource.com/c/1413416
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625716}