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This CL does not show the palette tray unless a stylus event has been previous seen (unless the device contains an internal stylus). Stores a pref to track whether a stylus has been seen before and if not, a pointer watcher is fired up to look for stylus events.

Bug: 740298
Test: ash_unittests "PaletteTray*Test.*"
Change-Id: I75d03dd382321a4f4e2324a5c9bec43b7b3c02c3
Reviewed-on: https://chromium-review.googlesource.com/592228
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491873}