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I am implementing the "Divider snapping" animation specified here:
https://mccanny.users.x20web.corp.google.com/www/splitscreen-motion/index.html#project-resizing
Notice that the window bounds update continuously with the snap
animation. That is what makes it so much more complicated to implement
than the "Divider selection" part and the "Divider deselection" part.

Test: ash_unittests SplitViewOverviewSessionTest.SplitViewOverviewBothActiveTest
Test: ash_unittests SplitViewOverviewSessionTest.DragDividerToExitTest
Test: ash_unittests SplitViewOverviewSessionTest.SnappedWindowBoundsTest
Test: ash_unittests SplitViewOverviewSessionTest.OverviewHasMinimumBoundsWhenDividerDragged
Test: ash_unittests SplitViewControllerTest.SplitDividerWindowBounds
Test: ash_unittests SplitViewControllerTest.InternalDisplayConfigurationChange*
Test: ash_unittests SplitViewControllerTest.SwapWindows
Test: ash_unittests SplitViewControllerTest.DoubleTapDivider
Test: ash_unittests SplitViewControllerTest.DragAndDouble*Divider
Test: ash_unittests SplitViewControllerTest.SnapWindowDuringDividerSnapAnimation
Test: ash_unittests SplitViewControllerTest.StartDraggingDividerDuringSnapAnimation
Test: ash_unittests SplitViewControllerTest.DividerPositionOnResizingSnappedWindowWithMinimumSizeTest
Test: ash_unittests SplitViewControllerTest.EndSplitViewDuringDividerSnapAnimation
Bug: 884930
Change-Id: I2494998606a340d75a87bf96fb5f83d38c751bb3
Reviewed-on: https://chromium-review.googlesource.com/c/1480869Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636145}