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This CL creates a button that enters window repositioning mode. There
is still a great deal of work to be done -- the behavior once we're in
the mode is not what we ultimately want -- but this gets some of the
infrastructure out of the way. Subsequent patches will refine the
repositioning UX.

Bug: 799270
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I826a5868d17ee2d1ed5e69b7e1c75eb81142623e
Reviewed-on: https://chromium-review.googlesource.com/888540Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532142}