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The HomeLauncherGestureHandler does not use last_event_location_ and
last_scroll_y_ in  kDragWindowToHomeOrOverview and  kSwipeHomeToOverview
mode except for derermining:
*   whether drag is in progress
*   the final state for slide up/down in OnTabletModeEnded

For the first usage, checking the mode_ value should provide the same
information.
In the second case, finalizing slide up/down state is not the intended
behavior - requesting drag mode controllers to cancel current drag
operation would be more suitable course of action.

BUG=1005366

Change-Id: I4ec543ae24c854edd681716aa784fe2925554679
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872302
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708431}