Adding new AudioManager Android API

As eurekasource has moved to using Android O sdk, exposing the new
requestAudioFocus() and abandonAudioFocusRequest() in CastAudioManager.

Bug: 79420443
Test: Verified that request focus and ducking still works.
Change-Id: I60f4109c635dd1047db24071868e2084ec98d169
Reviewed-on: https://chromium-review.googlesource.com/1144520
Commit-Queue: Shyamsundar Parthasarathy <shyamsundarp@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576934}
1 file changed