Allow webplot to use multiple protocols The underlying remote touch device classes support multiple touch protocols now, but webplot didn't have a way to pass that information through. This CL adds a new command line parameter --protocol which allows the user to specify a protocol if they'd like. BUG=none TEST=manually tested Change-Id: I25c7aaca7d2a40f92ff13c005cdfc2e1297145cc Signed-off-by: Charlie Mooney <[email protected]> Reviewed-on: https://chromium-review.googlesource.com/389551 Reviewed-by: Shyh-In Hwang <[email protected]>