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The criteria of opening wallpaper picker should be consistent between
the settings page [1] and the shelf context menu [2]. Another pending
CL [3] will combine these two places to avoid duplicate logic.

The criteria of whether to show the 'shelf position' option remains
unchanged and it should be separate from the logic of wallpaper picker.

[1] https://cs.chromium.org/chromium/src/chrome/browser/ui/webui/settings/appearance_handler.cc?q=appearance_handler&sq=package:chromium&dr=C&l=76
[2] https://cs.chromium.org/chromium/src/chrome/browser/chromeos/background/ash_wallpaper_delegate.cc?dr=C&q=ash_wallpaper&sq=package:chromium&l=73
[3] https://chromium-review.googlesource.com/c/chromium/src/+/848193

Bug: 806051
Change-Id: I99da5e9bfef4dc02a2cdc53b33862d6310d88e14
Reviewed-on: https://chromium-review.googlesource.com/887251
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532026}