Allow ConnectionService to ask Telecomm for ringback

Cherry picked from branch lmp-preview-dev because checking the changes into master required an API update, whereas the relevant APIs are @hide-ed in the source branch.

Implements the necessary wiring to respond to a ConnectionService that
asks Telecomm to play ringbacks on its behalf.

Bug: 15190301
Change-Id: Ic6a6c031aa92df1f3587daf74f24d090cd21245b
(cherry picked from commit 50a57136b3aa876c8311b58e1e11720a337fe1cc)
5 files changed
tree: a44b84c8a74d2766d9f1fda236f3c6ccb5387bbe
  1. libs/
  2. res/
  3. src/
  4. tests/
  5. .classpath
  6. .project
  7. Android.mk
  8. AndroidManifest.xml