Get the spec min/max x/y/pressure from the device

In this patch, the server gets the specs from the device and
passes them to the chrome instead of hard coding them.

BUG=chromium:443539
TEST=Manually execute webplot.py and verify that the chrome side
gets the specs correctly.

Change-Id: I85dd0f43e2469f53bf879f6166a3aa926f005b39
Reviewed-on: https://chromium-review.googlesource.com/241365
Reviewed-by: Charlie Mooney <[email protected]>
Commit-Queue: Shyh-In Hwang <[email protected]>
Tested-by: Shyh-In Hwang <[email protected]>
3 files changed
tree: 498aae8a95b7a2bda804a73979a6a5dacdbf4c59
  1. remote/
  2. webplot
  3. webplot.html
  4. webplot.js
  5. webplot.py