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Other changes:

Add test methods to drag_handle class
Modified shelf_widget GetDragHandle() to return DragHandle* instead of View*
Modified DragHandle::ShowDragHandleNudge() to fetch timeout for current pref instead of taking it as an argument.
Fixed bug where ShowDraghandleNudge did not call handleNudgeShown.

Revert "Revert "Add unit tests for drag handle nudge.""

This reverts commit 4b6df1eb.

Bug: 1034168
Change-Id: I73258ce83cd681a936fec907b04ef065b6d10592
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080558Reviewed-by: Manu Cornet <manucornet@chromium.org>
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745695}