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Before the present CL, SplitViewController::OnDisplayMetricsChanged
checks divider_closest_ratio_ against its initial value zero, which is
actually a "legitimate" value (it represents the divider position at the
extreme left or top). The present CL changes that initial value to NaN.

Test: ash_unittests SplitViewControllerTest.InternalDisplayConfigurationChangeDuringDividerSnapToLeft
Bug: 1006859
Change-Id: I1a89ea4b75d599251d77297449fd1d3a253eca26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815916Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699546}