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The plan is to ship all tablet features together in M70. This CL will
be merged to M69 and reverted in M70.

Bug: 800945
Change-Id: I8ca2adb4b8b0c1715d7229f48bb521d0dd3ed35b
Reviewed-on: https://chromium-review.googlesource.com/1198523Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587898}