Gather touchscreen info on touchscreen devices. Errors are thrown in the output if the touchscreen command is run on devices that don't have one. BUG=None TEST=Manual; Ran it Change-Id: Idb52e80c08107476fc76f336207c843d4a5bf078 Reviewed-on: https://chromium-review.googlesource.com/222331 Tested-by: Kris Rambish <[email protected]> Reviewed-by: Katherine Threlkeld <[email protected]> Commit-Queue: Kris Rambish <[email protected]>