Adding a new message type to the Mojo channel.

Adding a new Channel::Message type and changing Channel so it
supports the old and the new messages.
This will help when modules using different version of Mojo
communicate.

BUG=695510

Review-Url: https://codereview.chromium.org/2710193003
Cr-Commit-Position: refs/heads/master@{#453814}


CrOS-Libchrome-Original-Commit: 823ec06c330538e88cf641061ea42cd607254e57
6 files changed
tree: 89b7192bea003702a9eb72d5321c01384ba1d736
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/