Overhaul Mandoline event transport code

In the course of its development, Mandoline's event code has diverged away
from event payloads that are a good fit with the current state of blink's
input handling logic. This CL begins a process of updating the event code
with an extended wheel interface capable of supporting the standards track
wheel event and revised pointer events that will be extended in a future
CL with support for the pointer events specification.

BUG=524828

Committed: https://crrev.com/895c6c35457b7fe13da31e862cd50eb537d5e7e6
Cr-Commit-Position: refs/heads/master@{#349015}

Review URL: https://codereview.chromium.org/1313353010

Cr-Commit-Position: refs/heads/master@{#349303}


CrOS-Libchrome-Original-Commit: 9c57b5f85a889b3511ad56003aa634f80c0e9f9a
1 file changed
tree: 38fe6c774d390e64215e1a2c9422642c94e1171f
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/