[MediaSession, Android] Adding visibility tests for MediaSession

content/browser/media/session/media_session.cc

Index: content/browser/media/session/media_session.cc
diff --git a/content/browser/media/session/media_session.cc b/content/browser/media/session/media_session.cc
index 0d4ed1e9efaff784cfbc7ae1d3ed3c8a4866265c..f395c536a0dc8c0882644f73ce2664234d22ff28 100644
--- a/content/browser/media/session/media_session.cc
+++ b/content/browser/media/session/media_session.cc
@@ -203,6 +203,10 @@ bool MediaSession::IsSuspended() const {
   return audio_focus_state_ != State::ACTIVE;
 }
 
+MediaSession::State MediaSession::audio_focus_state_for_test() const {
+  return audio_focus_state_;
+}
+
 bool MediaSession::IsControllable() const {
   // Only content type media session can be controllable unless it is inactive.
   return audio_focus_state_ != State::INACTIVE &&