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snapping to docking.

This CL adjusts the logic which selects whether a window will be snapped to
half of the workspace width or will be docked at the end of the drag when the
window is dragged to the edge of the workspace in the special case of the dock
being visible. The CL makes it easier to snap a window to half the workspace
width in this special case (and harder to inadvertently dock the window)

BUG=484877
TEST=None

Review URL: https://codereview.chromium.org/1127133003

Cr-Commit-Position: refs/heads/master@{#329268}