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When you enter docked mode while tablet mode is forced via
chrome://flags#force-tablet-mode, that setting to force tablet mode
shall still be respected, whereas the current behavior is to enter
clamshell mode and then stay in clamshell mode even if the lid is
flipped to tablet position.

Test: TabletModeControllerForceTabletModeTest.DockInForcedTabletMode
Bug: 929373
Change-Id: I3d0c2ec937f424b02c53ee1d2ab9019271f7f1d0
Reviewed-on: https://chromium-review.googlesource.com/c/1457466Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629831}