[Cast] Repurpose CastInitializationStatus for variable frame size support.

media/cast/sender/audio_sender_unittest.cc

Index: media/cast/sender/audio_sender_unittest.cc
diff --git a/media/cast/sender/audio_sender_unittest.cc b/media/cast/sender/audio_sender_unittest.cc
index 7bbfd1a37269360310899ae1274a1b6767056d9c..0e33da0fde0fc36f48828ca51def4cd3f2823d0f 100644
--- a/media/cast/sender/audio_sender_unittest.cc
+++ b/media/cast/sender/audio_sender_unittest.cc
@@ -21,6 +21,17 @@
 namespace media {
 namespace cast {
 
+namespace {
+
+void SaveOperationalStatus(OperationalStatus* out_status,
+                           OperationalStatus in_status) {
+  DVLOG(1) << "OperationalStatus transitioning from " << *out_status << " to "
+           << in_status;
+  *out_status = in_status;
+}
+
+}  // namespace
+
 class TestPacketSender : public PacketSender {
  public:
   TestPacketSender() : number_of_rtp_packets_(0), number_of_rtcp_packets_(0) {}
@@ -86,9 +97,14 @@ class AudioSenderTest : public ::testing::Test {
         task_runner_,
         PacketReceiverCallback(),
         &transport_));
+    OperationalStatus operational_status = STATUS_UNINITIALIZED;
     audio_sender_.reset(new AudioSender(
-        cast_environment_, audio_config_, transport_sender_.get()));
+        cast_environment_,
+        audio_config_,
+        base::Bind(&SaveOperationalStatus, &operational_status),
+        transport_sender_.get()));
     task_runner_->RunTasks();
+    CHECK_EQ(STATUS_INITIALIZED, operational_status);
   }
 
   ~AudioSenderTest() override {}